4. Smokey Robinson was also in attendance at Aretha's birthday party.
2. The surprise concert was announced just hours before it took place.
Britney Spears Performs In Las Vegas
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 Britney took the stage for a surprise performance at Rain Nightclub in the Palms Hotel and Casino in Las Vegas. Photo: Splash News
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Britney Spears Performs In Las Vegas
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 The surprise concert was announced just hours before it took place. Photo: Splash News
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Britney Spears Performs In Las Vegas
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 Just before the concert Britney tweeted: “Looks like my little secret isn’t a secret anymore. Who’s coming to watch me take the stage TONIGHT? You’re all invited. Be there or be square bitch!” Photo: Splash News
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Britney Spears Performs In Las Vegas
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 Before the concert the Jersey Shore’s DJ Pauly D warmed up the crowd. Photo: Splash News
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Britney Spears Performs In Las Vegas
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 The concert was filmed as part of an upcoming MTV special. Photo: Splash News
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Britney Spears Performs In Las Vegas
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 Britney debuted some songs off her new album, as well as remixed new tracks with old hits like “Slave 4 U” and “Gimme More.” Photo: Splash News
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