Common and Serena Williams (Getty Images)

Common and Serena Williams

*Despite rumors that Serena Williams got “flirty” with Formula 1 star Lewis Hamilton on Halloween, the tennis ace was back in familiar territory a night later with her ex-boyfriend, Common.

According to spies for Page Six, the two were spotted 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 witness.

Via Page Six:

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.