HOLLYWOOD power couple WILL and JADA PINKETT SMITH are at war over their 12-year-old daughter, Willow.

The precocious preteen recently released a sexed-up video for her new single, “Summer Fling,” in which she sings about midnight walks on the beach and prances around with boys who look MUCH older than her.

A source says mom Jada gave the project the green light – and now dad Will is furious!

“He’s fit to be tied,” disclosed an insider. “He almost had a heart attack the first time he saw the video.

“Will lashed out at Jada, saying, ‘How could you let my little baby do this?’ Will is very traditional and worries that his kids are growing up too fast.”

Will, 44, and Jada, 41, have been married for 15 years, but an insider says the union has been rocked by recurring disagreements over what’s appropriate – and what’s not – for their kids.

In December, The ENQUIRER revealed that Will started a family “boot camp” to bring his kids back in line after Willow and her brother, Jaden, 15, pulled a series of out-of-control antics.

In April 2012, Willow took to her Tumblr page to write a disturbing post in which she made shocking references to mental illness, suicide and drug use. Jaden, meanwhile, caused a stir of controversy when he was accused of blasting a female fan in an expletive-filled tirade on social media, which he denied.

“Will and Jada are bickering nonstop  about their children,”  continued the source.

“They’re locked in a tug of war and don’t agree on anything these days.

“Jada is very strongwilled, but now Will is threatening to put his foot down once and for all.

“He’s sick of seeing his daughter act like she’s 12 going on 24.”