The suit, filed by the same attorney who filed teen sex abuse suits in recent weeks on behalf of Michael Egan against Singer and three others, alleges that Broadway producer Gary Goddard and the filmmaker sexually assaulted the unnamed guy when he was a teen, said The Hollywood Reporter.
The British citizen alleges that Goddard at first approached him via social media when he was 14. Goddard allegedly told him that he was good-looking and there were some people in Hollywood and London who could help him with acting career.
It further states that two sexually assaulted the teenager when he was 15.
According to the suit, the man "only recently became cognizant that he has suffered psychological and emotional injuries, mental anguish and loss of enjoyment of life as a result of the Defendants' sexual acts."
Singer's lawyer, Marty Singer (no relation) dismissed the allegations as "totally untrue".
A lawyer for Goddard also has released a statement denying the allegations.
The new suit was filed on May 3 in federal court in LA.
Singer was earlier sued for allegedly sexually abusing an underage boy in 1999.