Credit: Richard Knapp/Lifetime.

Last September, Bristol Palin was heckled at a West Hollywood bar and restaurant by a man who called her mom, Sarah Palin, a "whore" and made a crude reference about Bristol's former relationship with the father of her child, Levi Johnston. That heckler is now suing.

According to TMZ.com, Stephen Hanks' lawsuit notes that Bristol suggested he is a homosexual during their exchange, which occurred while she was shooting a segment for her new Lifetime series, "Bristol Palin: Life's a Tripp." Hanks claims he's been featured in ads for the show despite the fact that he never signed a waiver.

Hanks also states that Bristol falsely claimed to a magazine that the incident was the reason why she moved from Los Angeles back to her native Alaska. He argues that Palin bought a home in Alaska two months before the incident.

Hanks is alleging defamation in his lawsuit and is seeking unspecified damages from the daughter of the former Alaska governor and Lifetime's parent company, A&E. "Bristol Palin: Life's a Tripp" premieres on Lifetime June 19.