Rihanna: Barclaycard Wireless Festival Performer!

Rihanna bears her toned tummy on stage while performing at the Barclaycard Wireless Festival held at Hyde Park on Sunday (July 8) in London, England.

The 24-year-old singer was one of the headlining acts of the evening, including Drake, Deadmau5, Nicki Minaj, and Pitbull!

Meanwhile, Rihanna is in the middle of a lawsuit – she is suing her former accountants for “gross mismanagement” of her money, according to ABC. Reportedly, Rihanna pocketed six percent of her total revenue, while the firm got paid twenty two percent.

Also pictured inside: Rihanna leaving her hotel that same day en route to the festival.

10+ pictures inside of Rihanna rocking out at the Barclaycard Wireless Festival…