Despite getting “flirty” with Formula 1 star Lewis Hamilton on Halloween, tennis champ Serena Williams was out a night later with her ex-boyfriend Common, spies said.

A tipster said Williams and the rapper/actor were at Chinese eatery RedFarm on the Upper West Side at 11 p.m. on Tuesday.

“They came in just before the restaurant closed,” said a spy.

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A source close to the stars told us of the pair, “They are, and have been, good friends.”

Common admitted to Meredith Vieira last year: “It was kind of eventually a mutual breakup, but she initiated it. It’s OK, though . . . We’ve got a great understanding, and I care about her as a person.”

Williams has been spending time recently with Hamilton, sparking rumors of a romance.

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