VIDEO : Madonna Spanks Katy Perry on Stage

Katy Perry was hauled up onstage and spanked by Madonna as part of her birthday celebrations on Tuesday . She continued to toast the occasion on Tuesday by attending Madonna?s Rebel Heart Tour show at The Forum in Inglewood, California, and she was roped in to taking part in the singer?s saucy onstage segment during her song Unapologetic B**ch. After the performance, Madonna told Katy onstage, ?Thanks? I know you didn?t want to come up here and do this.