(entertainmentwise.com) - Charlie Sheen has been accused of regularly using a high-profile escort service.The Platoon star reportedly answered a newspaper advertisement for Nici's Girls, which charges customers $25,000 (?12,500) per night, and placed an order for four escorts.The 42-year-old, who was accused by ex-wife Denise Richards of having an unhealthy love for prostitutes and Internet porn, reportedly paid agency owner Nici $20,000 (?10,000) for their services.Nici made the revelations to Rolling Stone magazine journalist Vanessa Grigoriadis.The reporter tells Page Six: "When Nici dropped four girls off at his penthouse, she found the actor in silk pyjamas with 'C. MaSheen' embroidered over the pocket."Sheen gave her a $20,000 check for the girls, and she picked them up several hours later."Despite entering court-ordered rehab for substance abuse, Nici "continued to book girls for him, furtively sending them to a doctor's office in Los Angeles owned by a friend of Sheen's."The orderlies at the rehab centre would let him out for his frequent medical appointments."Nici told Grigoriadis she continued to send girls for Sheen at a hotel in Santa Monica, California until last year. Sheen became engaged to fiancee Brooke Mueller in July.In response to the allegations, Sheen's publicist Stan Rosenfield tells Page Six: "This is an old, old, old story. But, if you're looking for a really good story, I heard that Joe DiMaggio and Marilyn Monroe are getting a divorce."