She's got her body back and gone topless, but nobody expected a comeback performance to happen so soon.

The show was billed under fake band name The M&Ms when tickets went on sale but somehow fans soon cottoned on that this was troubled Brit's comeback and tickets appeared on the net for massively inflated prices.

The fans got their money's worth though as Britney performed a full strip on stage before dressing up as a schoolgirl - just as she did when she first burst onto the scene.

Check out the amazing video below!

COMEBACK FOOTAGE:

OOPS! WE MEANT THIS ONE!