During her concert in Minnesota, Madonna restarted her beef with Lady Gaga. It seems Madonna was offended because Gaga rejected her invitation to perform together.
She told the crowd: "I have the best fans in the whole world. So take THAT, Lady Gaga! You know, I invited her to sing on stage to sing with me. But, she turned me down. It's okay. I've been rejected before, it builds a little character."