Celebrities Working Out: Sean Lowe, Snooki, Justin Bieber, and More! (PHOTOS)

Hollywood stars are known for their great bodies, so they have to exercise their butts off day in and day out to shun those pesky pounds. Check out how some of Hollywood's hottest stars work on their fitness!

For example, Dancing With the Stars's "Weapon of Mass Seduction" Stacy Keibler is keeping her post-wrestling body taut, as this June 12, 2012, Instagram photo proves.

Click through to see the rest of the shots!