Entertainment Weekly: Taylor Swift is hardly the only pop star to invite her famous friends on stage. At Madonna’s Rebel Heart Tour stop Saturday night at the Barclays Center in Brooklyn, N.Y., the singer brought out Anderson Cooper. During her performance of the song “Unapologetic Bitch,” Madonna danced with the CNN host and spanked him, before offering him a banana. “Anderson thanks for being my Bitch tonight!!!!” she wrote on Instagram after the show.