Luck be a lady man tonight?

Has Mr. JT had enough of the Biel-ster?

A Page Six spy alleged to have seen Justin Timberlake "sitting with a bronze-skinned brunette with long brown hair all night at a cocktail table near the dance floor" at an HBO party on the roof of the Tribeca Grand.

"They were obviously into each other," said the spy. "It was just the two of them . . . he had no entourage at all."

Another source dished to us, "He is notorious. He will f**k anything." A rep for Timberlake said, "I have no comment on his personal life."

MY sources tell me it was none other than Antonio Banderas. Ummm-kayyyy.

Timberlake and Biel spent lotsa time together during the European leg of his world tour.