I’m told the occasion was the big-deal round-number birthday of Koch’s wife, Bridget Koch, the granddaughter of Pittsburgh Steelers’ founder Art Rooney.
Don’t ask about the age, a true gentleman never tells.
But the source added Koch flew in Perry from and her band from California for the hour-long concert by the pool. At one point, the pop star had some of Koch’s six children and some of the their friends on the stage with her.
Perry twittered about traveling to Florida but didn’t say she’d be playing for a billionaire four times over, No. 88 on the Forbes 400 richest Americans.
How much did the gig set Koch back? He’s not the kind of guy who tells. But if he paid the going rate to have Perry all to oneself, then he probably plunked down upward of $350,000!
Click here for a video of the show filmed from a neighbor’s rooftop!