Britney Secret Rehearsal Video?!

Looks like Britney is back with a vengeance! Our MSN insider got their hands on some behind-the-scenes footage which shows her rehearsing with dancers to a seriously fresh new track. So ... is she practicing for a tour, the VMAs, what???

[Watch the video here]

She's looking good. So can we expect a performance from Ms. Spears at this Sunday's VMAs?