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Captain Kirk once had his skivvies stolen out of his hotel room by a crazed fan.

“I was in a hotel and entertaining downstairs and when I came back to my room, my underwear was gone,” William Shatner told Page Six during Priceline.com’s 20th anniversary breakfast at Tuscany Steakhouse on Monday. “Somebody had been in my room and stolen my underwear.”

A woman then called Shatner’s hotel room and told him she had his underwear, saying she would only give it back when he signed some memorabilia for her. Shatner reluctantly agreed to meet the woman in the lobby.

When he got downstairs, he said, “I’m not going to sign all that.”

“She said, ‘Well, sign this’ and she opened her [shirt] up, and I ran,” he told us. “I grabbed my underwear and ran.”

To this day, the 87-year-old “Star Trek” actor has no idea how the woman got into his hotel room.

Shatner, who is also celebrating 20 years as Priceline.com’s spokesperson, is working on releasing two albums later this year — a Christmas album and a country one.