Pop star Britney Spears has sued a US magazine for $10m (£5.6m), accusing it of fabricating a story that she and her husband made a sexually explicit video.
Ms Spears is suing over an article in Us Weekly's October edition
An Us Weekly story that Ms Spears and husband Kevin Federline had made a sex video and were afraid it would become public was "bogus", the action stated.
The couple's Los Angeles Superior Court action seeks damages for libel.
But a spokeswoman for the magazine said: "Us Weekly has a credible source, and we stand by our reporting."
According to the legal action, an October edition of Us Weekly magazine reported that the couple had told their lawyers that "a member of their entourage had threatened to release raunchy footage of the two".
Ms Spears and Mr Federline married in September 2004
Ms Spears was reported in the magazine as saying that she feared "an X-rated tape starring the two may go public".
Us Weekly also reported that the couple gave a copy of the tape to lawyers on 30 September 2005 and were "acting goofy" while watching it with them.
Ms Spears' complaint asserts that the entire story is false.
"There was no laughter, disgust or goofy behaviour while watching the video in the company of lawyers because they did not watch any video, and because there is no such video," the action stated.
The article appeared about a month after Ms Spears, 24, gave birth to her first child, Preston.
According to the legal action, Ms Spears went to court after Us Weekly refused her request for a retraction, and "is instead maliciously standing by the bogus story".
The singer and Us Weekly clashed earlier this year, after it published photographs of Ms Spears on honeymoon with Federline in Fiji in 2004.
The 24-year-old pop star issued a statement in February criticising the magazine.
"Coming from a celebrity who sold pictures of both her wedding and her stepdaughter, it's unlikely the issue here is privacy," responded Us Weekly.
"Britney should start her own magazine if she'd like to dictate her own coverage."