<P> Princess Fiona is a fictional main character who serves as the female lead in DreamWorks' animated Shrek film series . She made her first appearance in the first film in the franchise, Shrek (2001), voiced by Cameron Diaz . </P> <P> In the first film, Fiona appears as a princess plagued by a curse that transforms her into an ogress each and every sunset . She is locked in a dragon - guarded castle for several years until she is "rescued" by an irreverent ogre named Shrek, whom she mistakes for a knight . Fiona is at first eager to have her spell broken via true love's kiss by Lord Farquaad so that she may remain human, but later she falls in love with Shrek . </P> <P> In the first film of the series, Fiona first appears as a princess bride selected by Lord Farquaad as part of his plan to become king . She encounters Donkey and Shrek, and at first the group holds hateful feelings towards one another . However, tensions begin to smooth over gradually and Shrek and Fiona begin to develop a close connection and fall in love . Late one night, Donkey learns that because of a magical spell that had been cast on her years before, Fiona transforms into an ogress every night, but by morning reverts to her regular human form . Shrek overhears part of the conversation, and believes that Fiona finds him too ugly for her, leading him and Fiona to get into a misunderstanding followed by a heartbroken Shrek bringing Lord Farquaad to get Fiona . Shrek and Donkey interrupt Fiona's wedding ceremony and prevent her from kissing Lord Farquaad, who then realises that Shrek is in love with Fiona and mocks him out loud . When the sun sets, Fiona turns into an ogre, and a disgusted Lord Farquaad orders Fiona detained and Shrek killed though he is almost immediately eaten by a dragon instead . Shrek and Fiona profess their love and they kiss, which breaks Fiona's curse, though she is now permanently an ogress . At the end of the movie, Shrek marries Fiona . </P> <P> In Shrek 2, Fiona tries to convince Shrek to meet her parents in the kingdom of Far Far Away (a parody of Hollywood). While there, her Fairy Godmother, who had her locked away in the tower to begin with, still believes she is cursed . When Fairy Godmother finds out that Fiona is in fact married to an ogre, Fairy Godmother plots to kill Shrek and replace him with her son, Prince Charming . It turns out that the original plan had been for Prince Charming, not Shrek, to rescue Fiona and marry her, the King's way of repaying the Fairy Godmother for a favor she had done him while courting Fiona's mother . Fiona briefly returns to her human form from the first film after Shrek drinks a "Happily Ever After" potion that he acquires with the help of Puss in Boots and Donkey, which makes both the drinker and their true love more beautiful . However, to make the change permanent Fiona must kiss her true love by midnight, leading Fairy Godmother to coerce King Harold into giving his daughter a love potion so she will fall in love with Prince Charming . Her plan ultimately fails when Harold, after seeing how much Fiona despises Charming, decides not to give her the potion . When Shrek tries to kiss Fiona so they can both remain human, she tells him that she wants to live happily ever after with the ogre she married . They then turn back into ogres, and Donkey (who had turned into a white stallion) turns back into a donkey . </P>

When does princess fiona turn into an ogre
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