The Queen of Pop's surprise appearance with Sabrina Carpenter at the music festival appears to have ended on a bum note. Madonna might have endeared herself to a new generation of fans with a surprise performance alongside Sabrina Carpenter at Coachella last week, but her appearance at the California music festival appears to have ended on a bum note. On Monday afternoon, the pop icon announced that several vintage pieces from her Coachella wardrobe ― including a lavender corset and dress as