From reimagined fairy tales to raunchy comedies and even some sci-fi fantasies, these women are headlining the season's biggest movies.

Cameron Diaz

WHAT TO EXPECT WHEN YOU'RE EXPECTING

"It was really hard to sit down!" says Cameron Diaz about strapping on a giant prosthetic belly for this comedy based on the best-selling baby manual. So did playing a mother-to-be along with her costars, including Jennifer Lopez and Elizabeth Banks, get Cameron's biological clock ticking? "Oh my gosh, I'm not worried about that," she says. "I don't think that belly is what I should base wanting to be a mama on."

Opens May 18

Kristen Stewart

SNOW WHITE AND THE HUNTSMAN

Kristen Stewart's Snow White isn't just a timeless beauty; she's also part Joan of Arc, leading an army of knights to battle her evil stepmother (Charlize Theron), who wants to eat Snow's still-beating heart. But Kristen is glad not to be playing a blushing Bella. "It's so rare to have a female lead character be so proactive," she says. "She pushes her own story forward. It's always good for women to feel empowered."

Opens June 1

Maggie Gyllenhaal

HYSTERIA

There's one advantage to starring in the true story of the doctor who invented the vibrator: "By the time I finished the movie, I'd been sent maybe 15 vibrators by different people in London with vibrator stores," says Maggie Gyllenhaal. And like her character, Charlotte, a 19th-century British women's rights activist who do