16 May,2011 09:34 AM IST | | Agencies
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.
