PopSugar was lucky to attend the Juicy Couture 5th Avenue flagship store opening in NYC where Jessica spoke about how she stays fit during the holidays. Click here to find out.

Renée Zellweger maintains her petite figure, by running three to five miles, six days a week, she told Self. The actress claims her fit lifestyle helps her stay sane, but it seems like her workout routine gives her a few more bonuses, too: Just look at those rockin' back muscles!

After moving stateside, Posh told Britain's The Sun that she runs four miles a day, seven days a week. There's no question the pint-size Spice Girl has the physique to walk the couture catwalk, but does her toned body look sleek or unhealthy?

When everyone's favorite Hills-star-to-hate went under the knife, she may have augmented more than her breasts. The paparazzi princess has said the surgery also boosted her confidence.

Do you prefer Heidi's dream body? Or was her pre-op physique picture-perfect?

The reality star's mile-long legs may stop traffic on the red carpet.  To keep her limbs in shape, Whitney told OK! she watches what she eats, hikes and works out with a trainer. But the hiking may have to be replaced now that she's traded her California digs for New York City.