Rihanna joins Bon Jovi onstage in Madrid

Surprised? Yeah, I was too!

Jon reportedly invited her to join them onstage for the show in Madrid tonight, and she accompanied them on Prayer.

I've never particularly had any opinion on her, but I definitely don't like the duo. It's like oil and vinegar to me - hip hop and rock don't mix lol.

She was cute on Twitter though - she posted right after the show: "Wait!...did I just rock out with Bon Jovi tonight??? WTFFFF!!!!!!!"