2008 Romantic Comedy. Anna Faris is a Playboy Bunny who gets kicked out of the mansion for being too old at the age of 27. With nowhere else to go, she ends up at a sorority house of losers that will lose their charter if they don't attract new pledges. Most of the film's humor comes from taking standard makeover and college sorority tropes and exaggerating them to point of light parody, while still playing them straight.
Cool Old Guy: The movie incarnation of Hugh Hefner is this. When he finds out that Shelly was tricked into leaving the Playboy Mansion, he personally tracks her down so that he can tell her everybody at the mansion misses her and invites her to come back home.
Eenie, Meenie, Miny Moai: These are seen at the party, even though the party has an Aztec theme. However, this is directly lampshaded by Natalie when she comments that the decorations, including the Moai, aren't accurate to the theme.
Fanservice: Shelly's naked ass, not even really a joke for it. They just wanted us to see it.
Marilyn Maneuver: (Parodied) Shelly tries the Marilyn maneuver while standing over an open pothole...and gets severely burned.
Mistaken for Gay: Shelly briefly thinks that Oliver is gay because she fails to seduce him on their first date.
Shelly: I don't think he likes me. He didn't fall for any of my tricks.
Natalie: That's impossible. Your tricks always work.
Shelly: I did sexy. I did other guys want me. I worked every angle in the book but - I don't know - he just kind of stared.
Natalie: What if Oliver is one of those guys who wants to have, like, a conversation with a girl before he hooks up with her?
Shelly: He's gay?
Modesty Towel: Played with. Shelly likes to "air dry." Natalie tells her she has to cover up because most of the girls in the house haven't seen their own bodies and Shelly naked may be too much of a shock.
Ms. Fanservice: Although this is mostly a Chick Flick, the fact that the movie features a very fit-looking Anna Faris wearing lots of revealing outfits means that guys (and some girls too) will have something to enjoy.
Not Distracted by the Sexy: On their first date, Shelly attempts to impress Oliver by dressing sexy, flirting heavily with him, and showing that other men want her. She doesn't accomplish anything besides making Oliver uncomfortable.
Out Giving Birth, Back in Two Minutes: The girl who was pregnant gives birth offscreen as the rest of her sorority fights for recognition...and comes back with her new daughter while still in her hospital bed.
Parental Abandonment: When Shelly was just a baby, she was left on the front porch of the Playboy Mansion.
Pity Sex: While not sex per se, in one scene Shelly mentions that she once let Bob Saget grind against her during a party as an act of charity.
Plucky Girl: Shelly, given all the troubles she has gone through.
The Pollyanna: Although dimwitted, Shelly is incredibly kindhearted and trusting. When people insult her, she always misinterprets it as a compliment and responds as such, resulting in an Insult Backfire.
Single Woman Seeks Good Man: Shelly ends up falling for Oliver, a genuinely nice guy who works at a retirement home and wants to get to know Shelly as a person instead of just trying to sleep with her.
Stop Helping Me!: Eventually in-universe, the girls say this to Shelly, when they realize that they've become petty like the Phi Iota Mu girls. Then they start to miss having her around, and invite her back.
Virgin Sacrifice: Sort of. A virgin is selected to be sent down a slide into a vat of warm gelatin for a party.
The Voiceless: The painfully shy Lily, who communicates via notes. When she does speak, it's to call out the other girls on the monsters they've become. It's also revealed that she's British.
What the Hell, Hero?: Lily gives one of these to her sorority sisters after their new popularity causes them to become shallow and conceited.
You Were Trying Too Hard: Shelly's first date with Oliver ends in disaster because, being used to guys who are just trying to have sex with her, she plays up her sexiness and flirts heavily with Oliver. But Oliver actually wants to get to know Shelly instead of just sleeping with her. Their second date goes just as badly because Shelly attempts to appear intellectual by toning down her appearance, wearing glasses that aren't prescribed to her, and uses note cards in an attempt to sound smart. At the end of the film she realizes that she was trying too hard to impress Oliver and decides to just be herself.