Madonna has 'revealed' onstage that Lady Gaga politely declined her offer of a bit of a singsong.
Having a chat with her fans during a 'gig', the 'Turn Up The Radio' hitmaker said (as quoted here): "I have the best fans in the whole world. So take that, Lady Gaga!"
She then went on to explain that she has tried to be Gaga's friend, but to no avail.
"You know, I invited her onstage to sing with me. But, she turned me down. It's okay. I've been rejected before. It builds a little character."