UPDATE: A rep from Britney says "We have not confirmed a performance at the Grammys at this time" ... so cross your fingers!

Craving more Britney Spears after hearing her new single? You're in luck, because she's booked to perform on the Grammys this February!

Spears, who hasn't sung at an awards show since her disastrous "Gimme More" gig at the VMAs in 2007, has reportedly "been rehearsing for weeks."

Dave Matthews Band, Green Day, Lady Gaga, P!nk, Beyoncé, the Black Eyed Peas, Lady Antebellum, Maxwell, and Taylor Swift are already scheduled to perform during the awards, which airs February 13.

More good Britney news today: Her single, "Hold It Against Me" is already #1 on iTunes!

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