Britney -- The Biggest Loser?!

4/12/2007 11:50 AM PDT
Britney Spears rolled back to a Studio City dance studio yesterday looking like a shell of her more recent self.

TMZ spotted the trainwreck-on-the-mend on her way out of Millennium Dance Complex, where it appears her jazzercise sessions are paying off. Brit looked like she's shed a few pounds, and could even be confused with her younger sis Jamie-Lynn -- well, a bald, tatted Jamie-Lynn.

Brit's dancing/Red Bull diet plan seems to be doing the trick. Now if only she could do something about that hair.