Wesley Snipes knuckled under to the demands of the mother of two of his children, marrying her in a brief civil ceremony with only one friend in attendance, The ENQUIRER has learned.

The “Blade II” star had dated Korean-born painter Nakyung “Nikki” Park for more than three years and lived with her at his gated Alpine, N.J., home. Friends say he made their relationship legal only after the 29-year-old divorcee gave him an ultimatum.

“She wanted him to marry her and make her two kids with him ‘legitimate,’ said a friend. “They had been feuding about this for some time. He finally gave up and said yes.

“It was a basic, ‘take it or leave it’ thing. He took her down to the courthouse and he married her — the poor woman didn’t even get a chance to walk down the aisle.

“And he didn’t promise her a honeymoon, either.”

Snipes and his girlfriend married at the courthouse in Hackensack, N.J., on March 17, according to a Bergen County court document obtained by The ENQUIRER.

A Bergen County courthouse employee who eyewitnessed the wedding told The ENQUIRER:

“The ceremony was strictly by-the-book.

“They were trying to be discreet. They were wearing everyday clothes, there was no photographer, no video, no crowds of friends.

“No one even recognized him.

“The only witness with them was an acquaintance of Snipes, a local lawyer named John Carbone, and they had to use a court employee as their second witness.

“It wasn’t exactly what you’d expect from a rich celebrity.”

Snipes and Park have two children together — a son and a daughter.

“She’s a sweet, lovely lady,” the friend said. “In a moment of weakness, he gave in to her.

“But he didn’t exactly show her a great wedding.”