<p><br /> After meeting on The X Factor last week, Rihanna joined Bon Jovi on stage in Madrid to sing the band's classic hit Livin' On A Prayer.<br /> </p><p><br /> Both artists were in the city ahead of the MTV Europe Music Awards.<br /> </p><p><br /> Bon Jovi fans were shocked when lead singer Jon called the Umbrella singer onto the stage at the Teatro Circo Price venue on Saturday night.<br /> </p><p><br /> 22-year-old redhead Rihanna was clearly delighted to have dueted with the rockstar, writing on her Twitter page:<br /> </p><p><br /> "Wait!... did I just rock out with Bon Jovi tonight??? WTFFFF! (What the f**k) (sic)."<br /> </p>
