Rihanna Joins Kanye West & Jay-Z On 'Watch the Throne' Tour

Joining in on one of the biggest acts this year, Rihanna made her way on stage for a surprise performance with Kanye West and Jay-Z for their "Watch the Throne" tour in London.

The Barbadian beauty took to the London O2 Arena on Sunday night (May 20) wearing a cropped black top, skinny jeans and a beanie to perform "All Of The Lights" with Kanye as well as joining in on Jay-Z's hit "Run This Town."

After leaving the arena, the 24-year-old took to her Twitter page to let her 19 million-plus followers in on her exciting night tweeting, "#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."

Before making her crowd-pleasing performance, the songstress also posted pictures of herself backstage at the event with friends and from her seats in the arena with a caption, "WTT tour #London."

The U.S. leg of the "Watch The Throne" tour will start October 28 in Atlanta, GA. Watch Riri's performance below!