Owen Wilson and a blond date in South Beach, Fla., were so smokin’ — they set off an alarm that evacuated an entire hotel.

Spies said that the Butterscotch Stallion — Wilson, 49, who’s been photographed in Miami showing off his fit bod on the beach — appeared after midnight with a woman at the Tavern at Hotel Croydon.

When the pair were allegedly sharing a smoke by the bathroom, lights began flashing.

“Owen set off the smoke alarm in the hotel by smoking a cigarette near the bathroom,” says a source. “The entire hotel was evacuated.”

Video footage of the incident shows Wilson’s date dancing with him as the alarm goes off.

They then casually slip out and into the night as Wilson ditches his drink on a patio and the woman puffs away.

Other guests were seen shuffling downstairs in their pajamas.

The hot hotel’s owned by Alan and Nathan Lieberman’s South Beach Group.

Wilson’s currently working on an animated film, “Naya Legend of the Golden Dolphin,” with Kate Winslet, Gerard Butler and Quvenzhané Wallis.

He dropped out of a planned TBS series in which he’d play God, with Daniel Radcliffe as an angel, called “Miracle Workers.”

His rep did not get back to us.

This story originally appeared in the New York Post.