Britney Spears: Wango Tango 2011 Presenter!

Britney Spears arrives at KIIS FM’s Wango Tango 2011 at Staples Center on Saturday (May 14) in Los Angeles.

The 29-year-old pop singer (in Herve Leger and YSL boots) is a guest host at this year’s star studded concert and introduced Lupe Fiasco with Ryan Seacrest.

Earlier today, 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.