Cristian injured during routine on 'Dancing'

LOS ANGELES, CA [PHOTOS: Celebs hit the dance floor!]

Turns out -- he pulled a muscle. He grimaced backstage while listening to the judges' scores, and walked off before the camera cut to commercial break.

Kristi Yamaguchi was temporarily dethroned from the top spot after her first dance. But she brought big hair and lots of enthusiasm in the second performance, pleasing two out of three judges. Len Goodman told her he wasn't a fan of that "boogaloo hip hop stuff." But Bruno Tonioli defended the choreography, saying "get rid of the cob webs, Len."

Tonight is the results show where the seventh couple will be eliminated.

Def Leppard takes the stage, performing "Pour Some Sugar on Me" and the band's new single "Nine Lives."

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