The cast of "Dancing with the Stars" didn't leave the studio this weekend -- where they rehearsed like crazy for tonight's big premiere.

Brandy, Rick Fox, Margaret Cho, Bristol Palin and even her adorable son Tripp were all spotted at the studio, while professional dancers Maksim Chmerkovskiy and Cheryl Burke made out for the cameras.

The gang above, plus Jennifer Grey, Audrina Patridge, Florence Henderson, Kurt Warner, David Hasselhoff, Kyle Massey, Michael Bolton and The Situation all hit the floor for the first time tonight.

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