So happy to cheer on Diana at Wasted Space at the Hard Rock Hotel...

The Make-a-Wish Foundation recruited Carey Hart and Pink to fulfill the wildest dream of a girl named Diana -- a 15-year-old with a serious heart condition.

They flew Diana to Vegas, where she took the stage and performed at Hart's club, Wasted Space, at the Hard Rock Hotel.

Click here for photos on TMZ.com.

Click here for article in RockOverAmerica.com.