'Presenting' Britney Spears!

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

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



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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