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Mackenzie: Papa’s pal Jagger bedded me

You can’t always get what you want — but Mick Jagger did. He bedded an 18-year-old Mackenzie Phillips on a steamy New York night in the late 1970s, she claims.

The wild child and “One Day at a Time” actress says she had sex with the Rolling Stones frontman during a raucous, drug-fueled party at the Central Park West home of her dad, folk-rock star John Phillips.

“I’ve been waiting for this since you were 10 years old,” Jagger allegedly told the then-18-year-old Phillips.

She says that she and the rock legend, who would have been about 35, went back to his apartment, which was in the same building, and had sex in the bed he shared with his then-wife, Jerry Hall.

“I’d known Mick since I was a kid, and maybe most people think their parents’ friends are old and gross,” she writes in her new bombshell tell-all “High on Arrival.”

“But this was Mick Jagger. Mick Jagger! He was hot. He had the most perfect ass in history.”

She says that she and Jagger had sneaked away while her dad was at the party, making the Stones singer a tuna-salad sandwich.

“In the middle of our tumble, my dad came back and started knocking on the door, yelling, ‘You’ve got my daughter in there!’ ” she writes. “I imagined he was more annoyed at losing the chance to show off his tuna-salad recipe than genuinely concerned about the defiling of his daughter.

“We ignored him, and he was finally on his way.”

She says that sex with Mick Jagger is still a fond memory.

“I was proud of my conquest,” she writes. “Or of having been conquested.”

The story is just one of many lurid anecdotes from Phillips’ wild life of sex, drugs ‘n’ rock and roll.

“High on Arrival” has already made jaw-dropping headlines for the 49-year-old’s claim that she and her dad — the former lead singer of the Mamas and the Papas — had consensual sex on and off for 10 years.

Mackenzie was the daughter of the 1960s San Francisco balladeer John Phillips and his first wife, Susan Adams, an East Coast blueblood who was a descendant of President John Adams.

From Mackenzie’s earliest days, her life was shaped by her dad’s self-absorption, drug abuse and neglect.

When she was 10, her dad gave her her first adult job.

“Dad said, ‘I’m going to give you a project,’ ” she writes. “Dad had a job for me! This was exciting. I was in.

“I got really good at rolling joints. I was the official joint roller for all the adults.”

Phillips says she was allowed so much freedom as a kid that the only rules her dad gave her were to spend one night a week at home and to always change her clothes before returning in the early morning.

“A lady never wears evening clothes during the day. It’s cheap,” John Phillips, who died in 2001, told her.

He did have one boundary. One day, Mackenzie found a purple pill in her dad’s bedroom.

She instinctively took it. But it turned out not to be just any pill — it was the last of the LSD pills made by the famous drug cook Owsley Stanley, and it was a collector’s item among moneyed celebrity druggies of the time.

“It was as if I’d crashed a normal dad’s Porsche,” she writes. “He said, ‘You took my last hit of Owsley. You’re grounded!’ ”

Mackenzie also recalls how, as a teen, she went to a party hosted by the Kennedy family, and had a lesbian experience.

“One of Andy Warhol’s cronies was there with his niece. I got in big, big trouble for seducing the niece,” she writes. “Her uncle was very upset, shouting, ‘How dare you? She’s just a child!’ ”

She also tells how during one night of partying, she and some pals got into a car with a man who raped her at knifepoint.

Mackenzie also admits to taking drugs while she was pregnant with her son, Sean. And she tells of doing drugs with her stepmom, Genevieve Phillips, while the older woman was pregnant with Mackenzie’s half-sister Bijou.

One time, Genevieve got so angry at Mackenzie over it, she kicked her, exclaiming, “It’s your fault Bijou’s retarded,” according to the book.

Bijou, in fact, is brilliant, Mackenzie points out.

Mackenzie also writes of being taken to a hospital after a miscarriage during her relationship with then-boyfriend Peter Asher. She was so addicted, she stole some cocaine from singer James Taylor to take on the trip, she says.

In her 20s, Mackenzie spent a night partying in Manhattan, then wound up at a drug den, where she was held hostage for several days, she claims. The ordeal ended when her dad sent a guy named “Big Sal,” who flashed a gun and rescued her.

“As we drove over the Verrazano-Narrows Bridge,” she writes, “I finally learned where I’d been all that time. Staten Island.”

todd.venezia@nypost.com