Katy Perry Joined Madonna Onstage To Take Shots From A Banana Bottle...

Katy Perry joined Madonna on stage on Tuesday night to toast her latest 'Rebel Heart World Tour' concert with a shot from a banana bottle.

But before that there was a heaps of twerking a bum slapping with lots of questionable dance moves from the two! 

Following her impromptu appearance, Katy posted this to her instagram:

Well, that was unrehearsed but 💅🏼 ILY @madonna my 👑QUEEN👑 #Repost @bahjournalist

A video posted by KATY PERRY (@katyperry) on Oct 28, 2015 at 3:18am PDT