Rihanna Joins Jay-Z, Kanye West on Stage in London

Jay-Z and Kanye West are in London, performing a few dates of “Watch the Throne” at the O2 Arena and, the other night, Rihanna too showed up during the gig.

The pop star took to the stage to sing her bit on “All of the Lights,” and fans went wild when they saw her.

Video of her surprise appearance is above but, as expected, it's not very good quality, having been shot by a fan lucky enough to get a seat in front.

“#RihannaNAVi made historih tonight as the first person to Watch The Throne AND join it!!! No one is allowed on that stage! Thank u guys,” Rihanna tweeted after the show, clearly happy with how it had turned out.