Alicia Keys surprised her L.A. fans by bringing out Kendrick Lamar during the fourth stop on her “Set the World on Fire” tour at the Staples Center. Rap-Up.com recalls, the R&B songstress began singing the Janet Jackson-sampled hook from Kendrick’s hit “Poetic Justice” before the Compton rapper emerged in all white to perform the rest of the song. “Kendrick, come on the […]