NYPD cop Joseph An had an unexpected pair of fans show up as he and 124 other Finest were promoted to sergeant Tuesday.

Brooklyn couple Sasha Cheng, 37, and her 39-year-old husband, Daniel Cheng, surprised the officer, 28, with a bouquet of flower to mark his promotion — one year after the cop jumped into action and got them to the hospital to save the life of their then-unborn baby.

“It was a breached baby,” Sasha recalled to The Post. “It definitely would have been life-threatening for both the baby and myself had Sgt. An not been there at the time. It was through divine intervention.”

Their son Royce Cheng is now a healthy 1-year-old.

The Chengs, who live in Bath Beach, were driving to New York Presbyterian Hospital in Lower Manhattan for Sasha to deliver Royce when they got stuck i

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