Derek Jeter (Getty Images)

Derek Jeter was joined by an attractive new female friend during a night out with the boys Thursday at STK Midtown. Jeter was spotted dining on steak with a male pal at about 8 p.m. but then left through the back door before returning shortly afterward to the same table with a few others, including the woman, for after-dinner drinks. Observers said the mystery lady was tall and attractive, with long, wavy, light-brown hair, and joined in the table’s conversation. But it wasn’t immediately clear whether she and Jeter are just friends or more. The Yankee captain split with Minka Kelly in February after three years of dating. The Yankees are facing the Detroit Tigers this weekend at the Stadium.