"Tik Tok" singer Ke$ha joined Usher, Justin Bieber, Adam Lambert, and more onstage for LA radio station KIIS-FM's annual Wango Tango concert at the Staples Center. As usual, the 23-year-old wowed us with her eccentric ensemble -- and not in a good way. Noel Vasquez/WireImage.com - May 15, 2010
Celebs Rock Out at Wango Tango
Ke$ha, Usher, Justin Bieber, and more perform and walk the red carpet at the annual concert in LA.