<P> A tie - in edition featuring the Season 1 poster and logo of the 2006 first novel in the Pretty Little Liars series was released on the date of the show's premiere, as was the final book of the original book series, "Wanted". "Wanted" later decidedly became the eighth book of the series, as Shepard later confirmed she would extend the series . A TV tie - in of the second book "Flawless" featuring an altered Season 3 poster was released on December 28, 2012 . </P> <P> The theme song for Pretty Little Liars is "Secret" by The Pierces, which was suggested by one of the show's stars, Ashley Benson . The pilot episode featured music from artists such as The Fray, Ben's Brother, MoZella, Orelia, and Colbie Caillat . The show has also featured music from Passion Pit, Lady Gaga, Pink, Florence and the Machine, Lykke Li, Selena Gomez & the Scene, McFly and Rachel Platten . Music from Katie Herzig can be heard multiple times throughout the show . A few songs being "Hey Na Na" and "Where the Road Meets the Sun". Madi Diaz has been heard on the show with her song "Heavy Heart", as well as Joy Williams with "Charmed Life" and Foreign Slippers with "What Are You Waiting For?". The last episode of season one featured a song by Alexz Johnson that she originally recorded for the soundtrack of the Canadian hit TV show Instant Star . On June 14, 2011, "Jar of Hearts" by Christina Perri was featured in the first episode of the second season . The song "Follow Suit" by Trent Dabbs has also been featured on the show . In the episode "The Perfect Storm", Lucy Hale sings a cover of the song "Who Knows Where the Time Goes?" by British band Fairport Convention . The official soundtrack was released on February 15, 2011 . </P> <Ul> <Li> Troian Bellisario portrays Spencer Hastings / Alex Drake, one of the five Liars . Bellisario also portrays Alex Drake in the final season, Spencer's identical twin sister, which is not truly revealed until the series finale . Spencer is an extreme perfectionist who likes to please her wealthy family and her friends . She is very competitive and an overachiever . Spencer is strong willed, smart, and kind towards everyone around her, but isn't afraid to take down someone who is a threat to something she cares about . She was in a relationship with Toby Cavanaugh (Keegan Allen) for most of the first six and a half seasons . Toby later joins the Rosewood Police Force to protect Spencer . Tired of being the victim, Spencer was a brief member of the "A" team after she thinks that she finds Toby in the woods killed by "A", but finds out from Mona that he is still alive and the only way to get to him is to become part of the team . She then learns that the only reason Toby joined the "A" team was to protect her . After the five year jump, Spencer dates Caleb Rivers (Tyler Blackburn) and lives in Washington, D.C. She returns home after the death of Charlotte Drake but ends up staying due to her mother running for the state senate . In the season 7 mid-season finale, it is revealed that she is the biological child of Mary Drake . After the five year time jump, it is shown she has continued with politics and is a paralegal at her mothers law firm . It is revealed that she had a twin sister, Alex Drake, who grew up in London, that became A.D to avenge Charlotte's death . </Li> <Li> Ashley Benson portrays Hanna Marin, one of the five Liars . Hanna used to have an eating disorder . She was overweight, with the nickname' Hefty Hanna' . After Alison DiLaurentis disappeared, Hanna lost weight and changed her style, which seemed similar to Ali's, with the help of her new best friend Mona Vanderwaal . Over the course of the series, Hanna cares more about the people around her and tries to protect herself and her friends . She is loyal and strong . She has had few love affairs through the series and was in a relationship with Caleb Rivers . After the time jump, Hanna was engaged to Jordan and working in the fashion industry, but has moved back to Rosewood and is married to Caleb . In the series finale, it is revealed that she is pregnant . </Li> <Li> Holly Marie Combs portrays Ella Montgomery, the mother of Aria and Mike, as well as the wife of Byron . </Li> <Li> Lucy Hale portrays Aria Montgomery, one of the five Liars . Aria is the artsy chameleon who is very intelligent, caring, and has a good sense of style . She's the one who keeps her family together . Aria spent some time as a "goth". She wore black, punk - like clothing and had pink highlights in her hair . After Alison disappeared, Aria and her family moved to Iceland for a year (because of Alison's disappearance), before returning to Rosewood . When Aria and her family moved back to Rosewood, she was no longer a "goth" as she used to be, she was a girly - girl . Aria had a relationship with her English teacher, Ezra Fitz (Ian Harding) from the very first episode of the entire show, but they decided to end their relationship before Aria went to college . After the time jump, Aria dates her co-worker, Liam, and then breaks up with him after she and Ezra start dating again . Ezra then proposes to her and they get engaged . Later, Aria joins the A-Team, after being blackmailed by Uber A . In the season finale, it is revealed that she is infertile which leads her to believe that she would never be able to marry Ezra; however, at the end of the episode she and Ezra are married . Aria finds out that she is unable to have children shortly before the wedding and tells Ezra the day before their marriage . He still wants to marry her . </Li> <Li> Ian Harding portrays Ezra Fitz, a former English teacher at Rosewood High who begins a relationship with Aria which causes a lot of tension due to her being his student . However they keep a steady relationship until season 4 when it is revealed that he is writing a book about the disappearance of Alison DiLaurentis which causes Aria to break up with him . It is also revealed that he had a very brief relationship with Alison before she disappeared after she met him in bar near Hollis with Charlotte Drake . After the time jump, Ezra is in a very bad place due to his girlfriend Nicole being kidnapped and killed in Nicaragua while they were there doing charity work . He is writing a book about his experience which is being published through the company Aria is currently working at which causes them to rekindle their old friendship . In the season 6 finale, they have sex which causes them to talk about their relationship and Ezra proposes to Aria which after some hesitation and a confession about the death of Archer Dunhill, she accepts . They are married in the series finale . </Li> <Li> Bianca Lawson portrays Maya St. Germain, a new girl who moves into Rosewood and develops a relationship with Emily, becoming her first girlfriend . She moves into Alison's old house which causes tension with the girls at first but they quickly begin to like her . She is killed in the season 2 finale by Lyndon James who was her stalker from a rehabilitation camp which she was sent to when Pam discovers weed in her bag . Lyndon disguises himself as her cousin who tries to get close to Emily so that he can kill her out of jealousy however, he is killed by Emily stabbing him in mid-season 3 . </Li> <Li> Laura Leighton portrays Ashley Marin, the mother of Hanna . In the first season she is working as a member of the bank until she is arrested as the suspected murderer of Darren Wilden . She is released when Mona takes the blame for murder and Pastor Ted posts her bail . She then begins working for Mrs DiLaurentis until her death when she chooses to leave as Jason takes over which causes tension due to their past relationship . After the 5 year time jump, she has now turned Radley into a fancy hotel and is working as the manager . </Li> <Li> Chad Lowe portrays Byron Montgomery, the father of Aria and Mike, as well as the husband of Ella . He is the center of one of the first story lines due to him having an affair with one of his students at Hollis causing all sorts of issues with his family . Due to this, him and Ella get a divorced but later remarry in season 6 with Aria as their officiator . Chad Lowe was the first cast member to direct an episode of Pretty Little Liars, followed by Troian Bellisario . </Li> <Li> Shay Mitchell portrays Emily Fields, one of the five Liars . Emily is the sporty one in the group . She is the best swimmer on the high school swim team, and eventually becomes a coach of the team . Emily's demeanor is kindhearted and very loyal to those she loves . Emily is a shy closeted lesbian in the beginning of the series, in love with Alison DiLaurentis . Over the course of the series, Emily came out to her parents that she was in a relationship with Maya St. Germain . After Maya's murder, Emily develops a relationship with Paige McCullers in season 3 . They're together for a while, until Paige betrays Emily's trust . After the time jump, Emily has dropped out of the university she attended in California after the death of her father and she came back to Rosewood with a secret . She ends up donating her eggs in season 6 to help to start a family . As of The Darkest Knight she is now working at Rosewood High School as the swim coach . In Season 7, it is revealed that Alison is pregnant with Emily's baby after A.D stole Emily's eggs after she donated them and impregnated Alison while she was in Welby . Emily confronts Ali about the baby and she agrees to have it for her . Soon after, Alison confesses her feelings for Emily and the 2 enter a relationship . In the series finale, Emily and Ali are raising twin girls, Lily and Grace . Alison proposes to Emily who accepts . </Li> <Li> Nia Peeples portrays Pam Fields, the mother of Emily as well as being the wife of Wayne . </Li> <Li> Sasha Pieterse portrays Alison DiLaurentis, one of the five Liars and the former "Queen Bee" of her clique, and the most popular girl in school before her disappearance . She enjoys using people's deepest secrets against them to keep them in line . Charming and manipulative, Alison managed to manipulate all four of her friends in one way or another and is skilled at finding ways to blackmail others . It was later revealed that Alison is alive and was on the run from "A". After the five - year time jump, Alison marries a man posing as Dr. Elliott Rollins, who was her sister Charlotte's psychiatrist . In the beginning of Season 7, Alison finds out that he is not the "good" man that she thought she married and with the help of the other girls, they manage to kill him before he kills them . Alison is now an English teacher at Rosewood High . It is also revealed in season 7 that she is pregnant with Emily's baby . Shortly after, she admits to being in love with Emily and enters a relationship with her and intends to raise the baby with her.In the series finale, she is raising twin girls, Lily and Grace, later on in the episode she proposes to Emily . </Li> <Li> Tyler Blackburn portrays Caleb Rivers, the high school boyfriend and later husband of Hanna Marin, and a professional hacker . It is revealed in season 1 that he was in the foster care system and slept in school or public places the majority of the time to avoid staying with his foster family . For a brief time he moves into Hanna's basement before moving in with Lucas . He also reconnects with his biological parents . He departs the show mid-season 4 to go to Ravenswood, which was a sister spin - off show of Pretty Little Liars . He returns in the 100th episode with a haunting secret which causes tension between him and Hanna . They both begin drinking, him to forget Ravenswood, her coping with Alison's return to Rosewood . After the time jump, it is revealed that he and Hanna broke up due to them working too much and he begins dating Spencer causing a love triangle between the three of them . In the mid-season 7 finale, he confesses his feeling for Hanna leading to them having sex prompting them to get back together . In "Choose or Loose", they elope in the courthouse and in the finale, Hanna announces she's pregnant . </Li> <Li> Janel Parrish portrays Mona Vanderwaal, the original and first "A". She is the person who stalked Alison before her disappearance, and did this as revenge for Alison crowning her "Rosewood's biggest loser". After Alison disappeared she became best friends with Hanna Marin and they transformed themselves into the most popular girls at school, taking Alison's place . In the season two finale she is exposed as "A" and sent to Radley Sanitarium, where she is visited by CeCe Drake (Charlotte), who takes Mona's place in the "A" game . In Season 3, she continues working as "A" and by the end of the season is kicked off the "A" team and becomes a victim of "A" along with the other girls . In Season 4 she helps the girls out with their investigations of the new "A". In season 5 she creates an army so as not to be intimidated by Alison's return . Later in the season, she fakes her own death to ferret out "A" but is kidnapped by "A" and imprisoned in "A" 's dollhouse . After the time jump, Mona is working for Veronica Hastings' rival for State Senator, and is revealed to be Charlotte Drake's killer . </Li> <Li> Andrea Parker portrays Jessica DiLaurentis / Mary Drake, twin sisters . Jessica is the mother to Alison and Jason, while Mary is revealed to be the mother of Charlotte and Spencer . Mary was admitted to Radley Sanitarium for most of her life, but has now returned to Rosewood . During the fourth season, Mary kills Jessica and attempts to frame Peter Hastings for it . However, this is not revealed until season 7 . She comes back to Rosewood later, now allied with Archer Dunhill . In the nineteenth episode of season 7, she takes the blame for the death of Archer Dunhill so the Liars won't have to go to prison . In the season finale, it revealed that she escaped prison with the help of Mona so that she could ally with Alex Drake, her other biological daughter, Spencer's twin sister who is revealed as "A.D.". </Li> </Ul> <Li> Troian Bellisario portrays Spencer Hastings / Alex Drake, one of the five Liars . Bellisario also portrays Alex Drake in the final season, Spencer's identical twin sister, which is not truly revealed until the series finale . Spencer is an extreme perfectionist who likes to please her wealthy family and her friends . She is very competitive and an overachiever . Spencer is strong willed, smart, and kind towards everyone around her, but isn't afraid to take down someone who is a threat to something she cares about . She was in a relationship with Toby Cavanaugh (Keegan Allen) for most of the first six and a half seasons . Toby later joins the Rosewood Police Force to protect Spencer . Tired of being the victim, Spencer was a brief member of the "A" team after she thinks that she finds Toby in the woods killed by "A", but finds out from Mona that he is still alive and the only way to get to him is to become part of the team . She then learns that the only reason Toby joined the "A" team was to protect her . After the five year jump, Spencer dates Caleb Rivers (Tyler Blackburn) and lives in Washington, D.C. She returns home after the death of Charlotte Drake but ends up staying due to her mother running for the state senate . In the season 7 mid-season finale, it is revealed that she is the biological child of Mary Drake . After the five year time jump, it is shown she has continued with politics and is a paralegal at her mothers law firm . It is revealed that she had a twin sister, Alex Drake, who grew up in London, that became A.D to avenge Charlotte's death . </Li>

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