Guide to Recognizing Your Wallflowers: Sam

SAM IS... A high school senior and stepsister to Patrick. After a past as a nonstop party girl, Sam's focused on getting into Penn State.

CLASSIC QUOTE: "I'm going to do what I want to do. I'm going to be who I really am. And I'm going to figure out what that is."

ACTOR: Emma Watson

ACTOR'S AGE: 22

BEST KNOWN FOR: If you don't know that Emma Watson played Hermione Granger in the Harry Potter film series for 10 years, then you've probably just time-traveled to 2012. Welcome. In the future, the whole world loves wizards.

Since her international debut as Harry Potter's smart best friend, Watson has transformed into the most fashionable young British actress that seemingly everybody wants to date. She briefly attempted to trade in movies for college (Brown University), broken up by a stint as the face of Burberry's 2009 campaign.

One more thing: She's also adorable on Twitter.

Her first post-Potter film project was a role in 2011's My Week With Marilyn, but Perks marks her first American-accented role.

NEXT UP: Watson recently wrapped shooting on Sofia Coppola's The Bling Ring, a crime drama based on real-life teenagers who robbed the homes of famous people in the Hollywood Hills. And she's tweeted a pic of herself behind the scenes.

Watson will play herself in Seth Rogen's The End of the World, a comedy about the apocalypse interrupting a celebrity party. Then in 2014, Watson joins Perks co-star Logan Lerman again onscreen in Darren Aronofsky's Noah.