Credit: Denise Truscello/WireImage.com; MAVRIXONLINE/CLUBCAPRIANDERSON

Charlie Sheen is going back to court.

On Monday, an attorney for Sheen, 45, filed a lawsuit against porn star Capri Anderson, claiming that she tried to extort him for $1 million, TMZ reports.

Anderson, whose real name is Christina Walsh, was Sheen's companion in the Plaza Hotel suite the night of Oct. 17 -- when the Two and a Half men star reportedly went on a drunken, naked rant and caused thousands of dollars worth of damage to the suite.

Sheen's suit claims that Anderson demanded "at least one million dollars" in exchange for keeping quiet about the incident; she threatened to go to prosecutors and have Sheen's probation (related to his Christmas Day scuffle with wife Brooke Mueller) revoked.

In interviews with Nightline and Good Morning America, Anderson has claimed that Sheen put his hands around her throat and threw things at her during his tirade.

Counters Sheen's lawyer: "At no time did Sheen assault, batter or threaten Walsh."

Anderson allegedly tried "to embarrass him and attempt to damage his career by going to the media with her false tale," the suit charges, calling her "an opportunistic pornographic film star and publicity hungry scam-artist."

Anderson is also accused of stealing Sheen's $165,000 Patek Phillippe watch during the melee.

Sheen is asking for unspecified damages.