Rap singer Snoop Dogg (search) has sued a woman and her attorneys for extortion, alleging they demanded $5 million to keep silent about an alleged assault against her, according to a lawsuit.

The lawsuit, filed in Superior Court on Dec. 10, said Snoop Dogg — whose real name is Calvin Broadus (search) — was not involved in the alleged assault at a performance in 2003.

The defendant was listed only as "Jane Doe" to protect her privacy, Snoop Dogg publicist Meredith O'Sullivan said Tuesday. O'Sullivan also declined to identify the woman's attorneys.

The lawsuit alleged that the woman and her attorneys threatened to sell details of the alleged assault to a book publisher and The National Enquirer (search) if Snoop Dogg did not pay $5 million.

Neither O'Sullivan nor the lawsuit provided details of the alleged assault.

The singer sued for punitive damages and to stop future threats.