Amid accusations he’s been an absentee owner during the Brooklyn Nets’ disappointing season, Russian billionaire boss Mikhail Prokhorov has been partying it up with a phalanx of beautiful women in the French Alps.

Prokhorov was spotted in the tony resort town of Courchevel with friends and an attractive entourage. A spy told Page Six that the NBA owner arrived at Le Comptoir de L’Apogée — known for its fireside Champagne Lounge and famous “ham-aging cellar” — to take over a private room Saturday night as the restaurant closed to its regular, rich customers.

“Twenty girls preceded him, and he then entered alone,” said a spy, who added that Prokhorov arrived in a black Mercedes and wore a beige turtleneck while the girls were “dressed to thrill.” The restaurant officially closed at 10:30 p.m., but it stayed open for his party with a private DJ and decor of white flowers and candles.”

The source said there were 20 women and “six to eight men” in a private room, and Prokhorov’s guards shooed away anyone who wandered over. A different spy said that a day earlier at another local hotel, a guy bravely tried to approach one of the women in Prokhorov’s posse and was warned by a Russian bodyguard “not to speak to the girls.”

Prokhorov was detained by Courchevel cops in 2007 for flying in women who were thought to be call girls, but he was officially cleared of the charge in 2009.

The Nets kingpin has been partying in the French ski town — near Meribel, where Formula One champ Michael Schumacher was in a skiing accident — during the celebration of Russian Orthodox Christmas.

But Prok’s Moscow-based rep insisted Monday night, “There were roughly the same numbers of men and women” at the dinner, and “Many of them were married couples.” She denied that anyone who tried to speak to one of the ladies was stopped by a security guard.

Prokhorov reportedly hasn’t attended a Nets game since October. His representative said he has not ­announced the dates of his next New York trip.