A video surfaced on the Internet Thursday purportedly showing Lindsay Lohan performing a sex act on her ex-boyfriend Calum Best, but both stars reportedly deny that they appear in the tape.

Lohan's representative's office told FOXNews.com that there is no statement at this time. A representative for Best told Us Weekly magazine it's not him.

"Sorry to disappoint you, but it's not Calum in the tape," his rep told Usmagazine.com.

Lohan is telling pals the woman in the film is absolutely not her, "But privately, nobody believes her. It is her," one told the New York Post's Page Six gossip column.

Best, a model and the son of English soccer star George Best, has a history of taking videos of women in intimate acts. Last May, Britain's Sun newspaper reported how Best, while partying with two prostitutes, "used his mobile phone to film a girl pleasuring."

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When the video of his antics was leaked and the Sun confronted Best, he confessed: "I've been stupid. I regret it all."