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How is it she just keeps looking better every year? Damn! Jealous?

Jen Aniston has had a busy 2009! That on and off relationship with loud-mouthed Mayer, not to mention two films - He's Just Not That Into You and Love Happens. Plus she has The Bounty Hunter and The Baster on the way! And through it all, she's maintained that bangin' bod...

Whether Jen is all scrubbed out, playing professional on set or all dressed up for the red carpet, the former Friends actress turned movie star always looks sleek and chic!

Sure, she still might not have a kid (or a steady man), but so what? Lady Aniston is a sunny SoCal girl for life. Happy birthday, babe!

Check out our MONSTER gallery of the best Jen pics - including ones with her past beaus, from Brad Pitt to John Mayer!