Jennifer Aniston might be best known for playing the sometimes-flirty, always-fashionable Rachel Green on Friends, but IRL, the 51-year-old actress seems remarkably down-to-earth, even when she's glammed up from head to toe. Jennifer skyrocketed to top of Hollywood's A-List in her twenties and has been in the spotlight ever since, thanks to her roles in hit romantic comedies like Along Came Polly, The Break-Up, and He's Just Not That Into You.