Jennifer Lopez filed suit in Los Angeles Monday claiming her ex-husband threatened to write a book about her if she did not pay him $5 million.

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The suit filed in Los Angeles Superior Court says Ojani Noa notified Lopez's attorney in 2005 he was looking for a publisher for a proposed tell-all book about Lopez, but he was open to "negotiate" if the singer/actress wanted him to call off the project.

Another letter, about a year later, said Noa "would not agree to refrain from marketing his book unless (Lopez) paid him a sum of $5 million," TMZ.com quoted the suit as saying.

The suit also accuses Noa of making false statements about Lopez to the New Post's Page Six gossip column.

Ojani Noa could not be reached for comment.