Microsoft Chairman Bill Gates is interviewed at the  Bing VIP Happy and Douchebag Premiere Party" during the Sundance Film Festival  On Friday, (AP Images for Bing)

You go, Bill.

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According to our ever-reliable Sundance Film Festival spy, Microsoft founder Bill Gates, 52, was spotted rocking out big time at Saturday’s John Legend/The Roots concert in Park City, Utah., hosted by search engine Bing.com. And, it seems, the brainiac sure can cut a rug.

Here’s the scoop, from our source:

“About halfway through the concert, I saw Bill Gates standing on a booth, talking to partygoers. As soon as the live music ended, a DJ started and Bill began dancing like a maniac.

“When Whitney Houston’s ‘I Want to Dance With Somebody’ came on, he really got into it right through to Madonna’s ‘Like a Prayer.’ Then, ‘Hey Mickey’ came on and he started doing the swim and getting low, almost touching the ground. He clearly had the most fun during ‘Old Time Rock and Roll,’ clapping, shaking his head and grooving back and forth like a nut.

“He had a security team in front of him trying to block guests from snapping pics. Finally, he got down from the booth but nearly fell, prompting security to help him out.”