Charlie Sheen filed a lawsuit late yesterday afternoon in Los Angeles County Superior Court, charging that Internet-video porn performer Capri Anderson, the woman in his suite during his Oct. 25 rampage at the Plaza Hotel, tried to extort money from him.

The suit comes in the wake of Anderson saying on "Good Morning America" early Monday that she herself planned to file suit as well as a criminal complaint against Sheen.

Sheen's filing, which TMZ.com placed online, says Anderson, a.k.a. Christina Walsh, concocted "an attempted shakedown and extortion" with "a sensational tale about being assaulted, battered and held against her will."

The suit claims she asked for at least $1 million to keep from presenting her allegations to the Aspen, Colo., district attorney. Sheen was on probation after pleading guilty there in June to a charge of assaulting his wife.

When Sheen declined to pay, the suit alleges, Anderson contacted the Aspen district attorney, who declined to take action. Sheen claims Anderson's attorney then asked for $500,000 to keep her from making her charges public on "GMA."

Anderson, 22, told George Stephanopoulos Monday on "GMA" that she had been hired to be Sheen's dinner date for $3,500, and at the request of a Sheen friend had seen the intoxicated star to his room. Once there, Sheen "was serving us both drinks, and he was snorting . . . a white powdery substance." Following this, she said, "There was a little bit of romance, if you will. . . . I was there willingly, initially."

But she became uncomfortable, she said, after "he put his hands around my neck. At that point things began to very rapidly fall apart and just really get out of hand." When she resisted, she said, he let go and "started throwing things." After hotel security alerted police, Sheen was taken to a hospital for psychiatric evaluation and released hours later.

Sheen's attorney, Yale Galanter, told ABC News that Anderson "never made any allegation of wrongful conduct on the part of Mr. Sheen the night of the incident." He said, "We will defend [her] lawsuit vigorously and will never pay her a dime."

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