It's no secret that LMFAO singer Redfoo is passionate about partying. Not only has LMFAO released the hits "Party Rock Anthem" and "Sorry For Party Rocking," but Redfoo's celebrated afro and neon clothing are not exactly subtle.

What you may not know about Redfoo, whose real name is Stefan Gordy, is that partying might not be his favorite pastime. That honor goes to tennis.

During the past few weeks, Redfoo has made his presence known at the U.S. Open. He has attended several matches, even in sitting in Sam Stosur's box during her second-round victory over Edina Gallovits-Hall. After closing out the match, the 2011 U.S. Open champion looked back at Redfoo and busted out his well-known shuffle.

Redfoo began playing tennis at an early age and went on to play on the junior circuits. In a recent interview with the U.S. Open's website, Redfoo said that for six or seven years, tennis was "all I did."

These days Redfoo is a little preoccupied, but he still makes time for tennis. He is coaching Ayaka Okuno, a Japanese player competing in the junior girls qualifying tournament. And his clothing company, Party Rock brand, is sponsoring a USTA Pro Circuit event in Las Vegas later this month. Fittingly, it will be called the Party Rock Open.

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