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Britney Spears confirmed that she would be following in Gaga's footsteps and performing tonight in Las Vegas, in what was supposed to be a secret show!

This morning Brit tweeted:

    Looks like my little secret isnt a secret anymore. Whos coming to watch me take the stage TONIGHT at @RainLasVegas at @PalmsLasVegas? -Brit


Earlier this week we reported that Britney was set to secretly take the stage at Palms Casino Resort in her first performance to support her upcoming album Femme Fatale, which drops next week. And now she's no longer hiding it!

Britney has encouraged everyone to come to the show, which is being shot for an MTV special, tweeting, "You're all invited. Be there or be square b*tch! -Britney"

See what else Brit revealed ... after the jump!