Charlie Sheen is allegedly back on drugs.

The Anger Management star - who has been in rehab five times and last hit the headlines for his erratic behavior in 2011 - has reportedly been spending up to $2,000 a day on cocaine over the past eight months.

"For at least the last eight months or so Charlie has been having a quarter to half an ounce of cocaine delivered to him every single day and was spending nearly $2,000 a day on drugs. Sometimes he'd even get two to three quarters of cocaine in one day," a source said.

The 47-year-old former Two And A Half Men actor - who is a father-of-five - is also said to be spending a huge amount of money on prostitutes and allegedly even paid for one of his favorite girls to undergo cosmetic surgery and bought her a new car.

"Sometimes he'd give his friends that party with him a grand or two just because he thought they were cool. And he always offered to share his drugs. He just wanted everyone to join in the party. There were always a bunch of young girls and random guys around. Charlie will always be a partier. It's just who he is," the insider added.