The pop star helped raise more than a half-million dollars for the foundation.
On Thursday, Britney Spears took a break from her "Piece of Me" Las Vegas residency for a spin class -- and it was all for a good cause.
The pop princess joined fans for her "Piece of Me Charity Ride," benefiting the Nevada Childhood Cancer Foundation. Fans were able to score a seat in the spin class if they donated to the charity. Also along for the ride was Extra host Mario Lopez. Below, Spears and Lopez pose with XCYCLE owner Jen Barnet.