Entertainment By TooFab Staff | 5/16/2010 3:50 PM PT Justin Bieber, Adam Lambert and Ke$ha were part of an all-star lineup who played KIIS-FM's Wango Tango concert yesterday in Orange County. From Usher to Kelly Rowland -- check out who else performed at the all-day event! #AdamLambert #JustinBieber #KeHa #Music #UsherRaymond
