We've talked about Blake Lively a few times here at That's Fit, but she's not the one who just completed a bad ass Nike ad. That honor goes to Taylor Momsen.

Momsen, known as "Little J" to her legions of Gossip Girl fans, doesn't exactly play a sporty character. She's more into short hemlines, massive amounts of eyeliner, and unfortunate haircuts. However, in real life (well, in a Nike commercial, anyway), she's beyond sporty -- she's practically a superhero.

After this, I wouldn't be surprised to see more paparazzi-prone starlets lacing up their sneaks when exiting Hollywood hotspots. It could be a new form of celebrity fitness -- 'razzi racing!

Everyone loves a holiday, but don't let yours derail your diet -- make sure you're staying active on the road.

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I recently interviewed Erin Andrews, the very pretty and fit sideline reporter for ESPN. While we spoke, Erin told me her secret to staying really fit and trim. After gaining 10 pounds "eating like a guy" with the College GameDay crew, Erin was mortified to see her much larger bum showcased all over the internet.

I was like "Oh my God!" she said. "What happened to my butt?!!!" And with that ... Erin hired a trainer, changed the way she was eating and made sure she didn't try to keep up with her male coworkers at the bar. Can you imagine having the world document each and every pound you gained each day of your life?

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