Nancy Sinatra Lets Slip About Past Michael Caine 'Set Up'

Nancy Sinatra clearly isn't afraid to kiss and tell.

The singer and eldest daughter of music icon Frank Sinatra recently divulged some tea about her acquaintance with Sir Michael Caine, after the duo were apparently set up on a date back in the '60s.

The gossip session began in the comments of an Instagram post shared by actor Cary Elwes, as he wished a belated birthday post to Caine, who actually celebrated his 90th birthday back in March.

"This man should always be celebrated. Happy 90th Birthday, Michael Caine! Thank you and Shakira for having me over. So much fun!??????" Elwes, 60, wrote in the caption—but it was Sinatra who stole the show with a spicy revelation.

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"He and I once went on a date that was set up by the studio," Sinatra, now aged 83, wrote, prompting a flurry of fans to further inquire about their reported rendezvous.

"Where'd you go?" one interested fan asked, to which the "These Boots Are Made for Walking" songstress actually replied to say that she and Caine went to the premiere of The Spy Who Came in From the Cold together back in 1965.

"thank you for sharing," the fan wrote back, while another chimed in to write, "I hope he treated you well. ??."

"In fairness you'd have been an awesome couple!" someone else quipped.

But, as we know, Caine instead went on to wed his second wife, Shakira Caine, to whom he has now been married to for five decades.

After divorcing her first husband Tommy Sands in 1965, Sinatra went on to marry Hugh Lambert, with whom she welcomed her two children, Amanda Lambert and AJ, before his death in 1985.

Next: Tom Cruise Embraces Michael Caine in Photos From Milestone Celebration