SEE How Michael Jackson’s Kids Spend Their Massive $8 Million A Year Allowance (PHOTOS)!

On a hot, lazy Las Vegas day, Michael Jackson’s eyes were glued to a catalog as he shopped from his hotel room for mundane but expensive trinkets such as Rolex watches, Barbie dolls and artwork.

The 2002 shopping spree continued until Jacko exhausted his line of credit with the hotel. Frustrated, he reached in a duffel bag and handed his 4- and 3-year-old kids a stack of bills totaling $20,000 and ordered their nanny to “take them out and buy them whatever they wanted.”

“He said, ‘Go out and entertain yourselves’,” recalled former pal Marc Schaffel, who’s poised to marry the late singer’s ex-wife Debbie Rowe later this year.

CARDIFF, WALES – OCTOBER 08: Michael Jackson’s children (from left

) Prince, Blanket, Paris perform at the ‘Michael Forever’ concert to remember the late Michael Jackson at The Millenium Stadium on October 8, 2011 in Cardiff, United Kingdom. (Photo Credit: Dave J Hogan/Getty Images)

Today, five years after Jacko’s death, the spending spree continues, with his three kids — now 17, 16 and 12 — enjoying a whopping $8 million allowance a year.

And that money — up from the $5 million stipend they used to split, thanks to the estate’s growing earnings — is separate from the $1 million-plus (up from $700,000) grandmother Katherine receives to watch over Prince, Paris and Blanket.

Among the expenses: Prince’s $30,000 yearly tuition at a private school and the six-figure yearly payout to house, educate and treat Paris at a therapeutic boarding school in Utah following her 2013 suicide attempt.

Prince, who’s already shown himself a ladies man, has showered more than $50,000 in custom-made jewelry and other gifts on at least three different girlfriends, a family insider said. That’s $10,000 more than he plunked down for a new Ford pickup truck.

Paris Jackson and Justin Bieber at the MICHAEL JACKSON HAND & FOOTPRINT CEREMONY CELEBRATING THE KING OF POP, January 26, 2012 at the Grauman’s Chinese Theater, Hollywood, California. (Photo Credit: Sue Schneider/MGP Agency)

Three vacations a year to destinations including Hawaii and Vegas annually set the kids back about $350,000 — after payments for bodyguards, relatives tagging along, chauffeurs, first-class airfare and plenty of luxuries.

In Hawaii, the family usually surfs the secluded beach and roams the Kahala Hotel & Resort in Honolulu. They relax in the $5,500-per-night Signature Suite.

At school, Paris buys gifts such as footwear and athletic gear for her friends. In Vegas, the kids have often enjoyed the 2,000-square-foot Penthouse Suite at the Bellagio, which runs from $4,000 to $5,000 nightly, not including the cost of the concierge they regularly use and access to the fitness center and the room-service tabs that have run as high as the cost of the room itself.

Blanket regularly dips into his inheritance, paying $200 an hour for karate lessons and more for a personal trainer.