Kate Bos-waif?

Classy, chic Kate Bosworth was spotted in NYC yesterday to promote her new movie, 21, and though we give her two thumbs up on her sophisticated outfit, we are a bit shocked to see how thin she's gotten in recent weeks. Her weight has been up and down, but a little less than a year ago we noticed Kate was looking healthier and happier - and now it would appear as though she's almost back to where she was roughly a year and a half ago!

Kate isn't the only celeb who appears to have shed some pounds lately: Nicky Hilton has been looking seriously skinny and Nicole Richie seems to be dropping the baby weight at a record rate. Note to the ladies in Hollywood: you don't have to be supermodel thin to be superhot!