Jennifer Aniston
Rachel or Raunchy: Whether she's playing one of our favorite Friends or a sex-crazed dentist, this Hollywood hottie always looks good.
Vote for which good-girl or bad-girl look you like best, and then click through the gallery to rate more actresses as they battle themselves for better or worse.
Natalie Portman
Honorable Amidala or Psychotic Nina Sayers? Actress Portman's played one extreme to another, but perhaps most far-ranging as the duo of Stars Wars' principled and law-abiding queen (left) and and Black Swan's madness-descending prima ballerina.
Cameron Diaz
Sweet & Sour Sweater Girl: How do you like your Cam: As the sexy hair-gel aficionado innocent of There's Something About Mary (left) or the saucy, scheming educator in Bad Teacher?
Kristen Stewart
Dark and Twisted Teenage Dreams: What's a K.Stew lover to do? When your good-girl look is Mr. Vampire's Valentine, your bad-girl look really has to rock. Like playing Joan Jett in The Runaways.
Anne Hathaway
When Bad Is Good: In The Princess Diaries, she's unquestionably in the sweet, dorky "good girl" category. But as Catwoman in the upcoming The Dark Knight Rises, she's a bit more...complicated. As Batman's sometime love interest, she's good, in that oh-so-bad kinda way. But as the catsuit-wearing, claw-bearing, biker babe, she's just plain bad. In a really good kinda way.
We've got our druthers. You?
Drew Barrymore
You've Just Got to Roll With It: Yeah, but which way? Drew's an adorable amnesiac in 50 First Dates and a rockin' rollergirl in Whip It.
Angelina Jolie
Hot Angie Any Way You Slice It: A total toss-up, but which Angelina wins: the uber-mom fighting to find her son in The Changeling or the uber-spy fighting to save her skin in Salt?
Halle Berry
Natural Woman or Supernatural Woman: The good-hearted widow of Things We Lost in the Fire battles her bad self, a.k.a., the things we get by turning into Storm and controlling the weather, in the X-Men movies.
Lindsay Lohan
Crazy-Cute or Just Plain Crazy? Back when she was making Herbie: Fully Loaded rather than, you know, being fully loaded, Lindsay was a darling. (Don't believe us? Time travel with her career in this gallery here.)
Or maybe you prefer her as a Machete's machine-gun toting nun and semi-naked wild child. Yeah, that's what we thought.
Jennifer Garner
Duking It Out: Jen looks every bit the angel-faced ingenue in Valentine's Day (though she did beat the crap out of a heart-shaped piñata). And she's not so much a bad girl as a badass in the title role of Elektra, but the costume alone tips the scales for us. What say you?
Julia Roberts
Pretty Good or Pretty Bad? It's all relative when it comes to the Pretty Woman who made us (almost) believe prostitution could be a fairy tale. But for the sake of argument, let's put that one in the bad-girl category. On the other hand, Roberts' blushing bride in Steel Magnolias is more her usual speed—a classic goody-two-shoes role for the A-list icon. Which Jules shines brightest?
Jennifer Lopez
American Idols: Anaconda bad-girl babe vs. innocent Selena: Who gets voted off?