Pop Princess, meet the Queen of Pop! Sabrina Carpenter brings out surprise guest Madonna for Coachella set

For die-hard Madonna fans, Sabrina Carpenter's Friday Coachella set was "like (an answered) prayer" as the "Queen of Pop" was brought out as a surprise guest. The music icon "struck a pose" and was met with raucous applause as she took the stage during Coachella Weekend 2's headline…