"Wait!...did I just rock out with Bon Jovi tonight???" Rihanna tweeted after joining the band for "Livin' On A Prayer" at a pre-European Music Awards concert in Madrid Saturday night. "WTFFFF!!!!!!!" The surprise duet was the highlight of the intimate gig, which also featured "Wanted Dead or Alive" and Bon Jovi's new single "What Do You Got?" Sadly, Rihanna didn't convince the group to tackle "Rude Boy" or "Shut Up And Drive."