Jennifer Aniston

Move over Julia Roberts! America's Favorite Sweetheart, Jennifer Aniston, turns 40 today... but check her out yesterday afternoon in Santa Monica - en route to a photo shoot - when she was still 39!

She may currently be starring in He's Just Not That Into You, but I'm SO into Jen these days! She has two hit movies in theaters, looks fab and is dating John Mayer. What's not to be jealous of?

Can't wait to find out what she has planned for her birthday tonight!