When Jennifer Aniston broke out as Rachel on Friends, she practically reinvented the girl-next-door archetype in her own image. But as time went by, Aniston grew into the rare kind of star who actually gets sexier as she goes along. (We like to think Helen Mirren is her spirit animal.) She flirted with her inner bad girl for a long time before fully embracing her in Horrible Bosses and We're the Millers. But allow us to look back at a few of her most memorably sexy moments.