In his best-selling new memoir, famed New York City restaurateur Keith McNally reveals that he had a steamy love affair with a famous Hollywood actress in the late 1990s. But he only refers to her as “X” in his pages.

Page Six did some sleuthing and announced on Tuesday that “X” appears to be Gillian Anderson — who was then popular for playing FBI agent Dana Scully in “The X Files.”

The New York Post gossip page based this conclusion on some of the references that McNally made in his book, “I Regret Almost Everything,” about the timing, location and circumstances of the tryst. Page Six also said that McNally, owner of the celebrity hotspot Balthazar, once publicly admitted to having a brief romance with Anderson. But for some reason, he’s eager to not mention her name in his memoir.

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