LMFAO’s Redfoo did some party rocking at Lavo on Monday night when his famous father, Motown founder Berry Gordy, threw him a surprise birthday party at the Midtown hot spot. Sources tell us Foo partied with 14 guests, but his LMFAO partner Sky Blu was nowhere to be found. Foo, a former player on the junior tennis circuit, has been hanging at the US Open as Ayaka Okuno’s coach. He’s also promoting his own line of zany Party Rock tennis gear, which has ruffled the tennis skirts of some more traditional fans. A spy sitting near Brooklyn Decker during an Andy Roddick match over the weekend was overheard questioning, “Who would play tennis wearing that?”