<P> Season three takes on a significantly greater serialized format . Rachel begins working at Bloomingdale's, an upscale department store chain, and Ross becomes jealous of her colleague, Mark . Rachel decides to take a break; and Ross, hurt and drunk, sleeps with someone else, causing Rachel to break up with him . In the meantime, Chandler has a hard time dealing with their breakup because it reminds him of his parents' divorce . After believing she has no family except her twin sister Ursula (Lisa Kudrow), Phoebe becomes acquainted with her half - brother (Giovanni Ribisi) and birth mother (Teri Garr). Joey develops a relationship with his acting partner Kate (Dina Meyer), and Monica begins a relationship with millionaire Pete Becker (Jon Favreau) which ends because of disagreements between the two . </P> <P> In the fourth - season premiere, Ross and Rachel briefly reconcile after Ross pretends to read a long letter that Rachel wrote for him, but continues to insist that the two were on a break so they break up again . Joey dates Kathy (Paget Brewster), a girl that Chandler has a crush on . Kathy and Chandler later kiss, which causes drama between Chandler and Joey . Joey forgives Chandler only after he spends a day in a box as punishment . Phoebe becomes a surrogate mother for her brother and his wife Alice (Debra Jo Rupp). Monica and Rachel are forced to switch apartments with Joey and Chandler after losing a bet during a quiz game, but manage to switch back by bribing them with Knicks season tickets and a one - minute kiss (off - screen) between the girls . Ross begins dating an English woman named Emily (Helen Baxendale), and the season finale features their wedding in London . Chandler and Monica sleep together, and Rachel decides to attend Ross and Emily's wedding . While saying his vows, Ross uses the wrong name at the altar (Rachel's), to the shock of his bride and the guests . </P> <P> Season five features Monica and Chandler trying to keep their new relationship a secret from their friends . Phoebe gives birth to triplets in the show's 100th episode . She gives birth to a boy, Frank Jr . Jr., and two girls: Leslie and Chandler . (They had originally thought that there were two boys and one girl, but decided to keep the name Chandler, despite the baby turning out a girl .) Emily states that the only condition in which she would remain married to Ross is if he stops all communication with Rachel . Ross agrees, but during a last dinner with all six main characters together, Emily phones Ross and, upon discovering Rachel is there, realizes she does not trust him, which ends the marriage . Phoebe begins a relationship with a police officer, Gary (Michael Rapaport), after finding his badge and using it as her own . Monica and Chandler go public with their relationship, to the surprise and happiness of their friends . They decide to get married on a trip to Las Vegas, but change their plans after witnessing Ross and Rachel drunkenly stumble out of the wedding chapel . </P> <P> In the sixth - season premiere, Ross and Rachel's marriage is established to be a drunken mistake . Ross and Rachel try to get an annulment because he doesn't want to have three divorces . However, he realized he couldn't do so and tried to keep their wedding a secret from Rachel . Nonetheless, they divorce several episodes later . Monica and Chandler move in together, causing Rachel to move in with Phoebe . Joey lands a role on a cable television series called Mac and C.H.E.E.S.E., where he stars alongside a robot . Ross gets a job lecturing at New York University and starts dating one of his students, Elizabeth (Alexandra Holden). The relationship ends because of their maturity differences . Phoebe and Rachel's apartment catches fire, and Rachel moves in with Joey, while Phoebe moves in with Chandler and Monica . Chandler proposes to Monica, who says yes even though her ex-boyfriend Richard confesses his love for her . </P>

Who got married in the cast of friends