Rihanna Surprises Fans By Joining Jay-Z Onstage At Wireless Fest! Watch HERE!

What could be better than seeing Jay-Z live?

How about we throw in Rihanna absolutely free!

The Stay singer decided at the last minute to go to London to perform a quick duet of Run This Town with her boy Jay at the Wireless Festival on Sunday.

Fans had no idea! Sounds like a deal to us!

Act now and you’ll get not one but two chart-topping performers showing a shocked audience how it’s done …AFTER THE JUMP!!!

[Image via Tyrone Beckford/WENN.]