Jessica Alba Jessica Alba was anything but an "Invisible Woman" this year, appearing in the Fantastic Four sequel, the gross-out comedy Good Luck Chuck and the squirm-inducing thriller, Awake. See Jessica's Red Carpet Gallery

Megan Fox While the cars turning into robots were cool, some would say the most impressive special effect in Transformers was 21-year-old Megan Fox. See Megan's Red Carpet Gallery

Emma Watson Emma Watson had her fans on the edge of their seats when it looked like she might not return for the last two Harry Potter films, but thankfully, she decided to stick with the series until graduation. See Emma's Red Carpet Gallery

Jessica Biel This year, Jessica Biel stretched her range in the Iraq War drama Home of the Brave, but it wearing that stretchy cat costume in I Now Pronounce You Chuck & Larry that took real courage. See Jessica's Red Carpet Gallery

Aishwarya Rai What do you do for an encore after being called "The Most Beautiful Woman in the World?" If you're Aishwarya Rai, you star in your first American action movie, The Last Legion. See Aishwarya's Red Carpet Gallery

Angelina Jolie Angelina Jolie made more headlines this year for her family life than her film roles, but she still earned a Golden Globe nod for A Mighty Heart and got demonic in the eye-popping Beowulf. See Angelina's Red Carpet Gallery

Shia LaBeouf Former child star Shia LaBeouf showed that he was all grown up when he headlined the surprise hit thriller Disturbia and then stood up to 30-foot-tall robots in Transformers. See Shia's Red Carpet Gallery

Scarlett Johansson Coming into the year as Esquire Magazine's "Sexiest Woman Alive," Scarlett Johansson took Manhattan as the lead in the big-screen version of the bestselling The Nanny Diaries. See Scarlett's Red Carpet Gallery

Lena Headey British beauty Lena Headey broke through on American shores in a big way as the lone female in the testosterone-powered epic 300. See Lena's Red Carpet Gallery