New Jersey Nets owner Mikhail Prokhorov has been living it up over the holidays in the French Alps surrounded by beautiful women. Spies said the Russian playboy billionaire’s entourage in Courchevel included a group of “12 gorgeous, tall brunettes and one blonde. They were drinking champagne at lunch, watched over by his personal assistant.” “Prok,” who is staying at a luxurious chalet, regularly entertains friends in a private dining room at chic hotel Chateau Cheval Blanc and is planning a lavish New Year’s Eve party tonight. His rep declined to comment.