Michael Jackson’s oldest son doesn’t turn 18 until next month, but he’s already living an R-rated life.
Prince Jackson, heir with baby brother Blanket and sister Paris to the King of Pop’s $1 billion fortune, is living large — making music with new pal Justin Bieber, sampling the Hollywood club scene, juggling multiple girlfriends and generally disregarding his guardians, a Jackson family source told The Post.
Prince has become a Belieber, hanging with the troubled 20-year-old superstar, who lives in the same Calabasas, Calif., community. Both are said to be mentored by that model of gentlemanly behavior — boxing champ Floyd “Money” Mayweather Jr.
“‘Money’ has been offering a lot of advice to Prince, including about women,” the source said. “It’s not as if he can turn to his family, because they’ve got their own thing going and they’ve never really had time for Prince, Paris or Blanket anyway.”
Since 2002, Mayweather has been accused multiple times of roughing up women, and in 2011 was sentenced to 90 days in jail for misdemeanor battery of an ex-girlfriend.
Mayweather has been the driving force behind secret recording sessions by Prince and Bieber, and the source said a “major recording album” featuring the unlikely duo is in the works.
“They really dig one another, and Floyd continues to check in with both of the,” the source said.
Prince, who receives a $66,000 monthly allowance from his father’s estate, is rarely home under grandma Katherine’s roof, often bouncing around Los Angeles, Las Vegas, Arizona, Hawaii and the Caribbean.
His heart is equally well-traveled.
In 2013, he dated Remi Alfalah, 16, a Kuwaiti princess.
He kept an ongoing romance with Nikita Bess, 17, whom he presented with a diamond-studded gold promise ring in August.
He and Bess spent a cozy evening together around that time, with her tweeting, “Thank you @princemjjjaxon for watching almost an entire season of The Office with me today.”
The couple called it quits in November.
When not looking for love, Prince can be found window shopping for luxuries.
“He’s looking at high-end cars like a Mercedes Maybach, a Rolls-Royce and Range Rovers and he’s buying expensive jewelry,” the family source said.
Their grandmother “doesn’t say much about Prince’s lifestyle,” the source said. “Michael’s brothers have been on the road so . . . They don’t really know what’s going on and, to be honest, it doesn’t really matter what they think because Prince knows his father didn’t care what his brothers thought, either.”
The anxious family source added, “With all of these young girls and Bieber and Mayweather’s influence, we just hope that he doesn’t make a big mistake that he’ll have to pay for the rest of his life.”