Britney Spears was the guest host at the KIIS FM's Wango Tango 2011 at Staples Center in Los Angeles. <img alt="" src="/imagedata/2011/may/britney.jpg" border="5" /> The 29-year-old pop singer introduced Lupe Fiasco with Ryan Seacrest at this year's star-studded concert. Earlier on Saturday, Brit tweeted "Rehearsals all morning. Wango Tango all night." Performers at the show include Ke$ha, Pitbull and Jennifer Lopez, Selena Gomez, T-Pain, Jason Derulo, Far East Movement, New Boyz, Cobra Starship, and more.

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Britney Spears was the guest host at the KIIS FM's Wango Tango 2011 at Staples Center in Los Angeles.

'Presenting' Britney Spears!

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'Presenting' Britney Spears!

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