Singer - known for his work on the X-Men film series as well as Valkyrie and The Usual Suspects - was sacked this week from his latest project, the Queen biopic Bohemian Rhapsody, with sources close to the production claiming the director had been feuding openly with the film's star, Rami Malek.
Singer is likely best known as the director of multiple films in Fox's X-Men franchise, starting with the 2000 original and as recently as 2016's X-Men: Apocalypse.
It's said that when they entered one of the rooms, Singer allegedly thrusted his body onto Guzman, forced him to the floor, and shoved the then-minor's face against his crotch, demanding oral sex. The suit says Singer then forcibly anally penetrated Sanchez-Guzman.
TMZ has obtained a copy of the suit, and it alleges that Cesar Sanchez-Guzman attended a party, which was attended by "many young gay males", on a yacht owned by tech investor Lester Waters. The suit was filed in Washington's King County by a man named Cesar Sanchez-Guzman, who alleges that Singer attacked him on a yacht when he was a minor. Although the alleged victim pleaded with him to stop, Singer allegedly wouldn't and caused him to choke.
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Another person encouraged the athlete to do "what feels right" and said she was still nursing her 17-month-old. She kicked off the year by winning the Australian Open - while she was pregnant.
Besides those two cases, Singer has been the subject of various other sexual misconduct allegations over the years.
Representatives for Singer did not immediately respond to BuzzFeed News' request for comment.
Jeff Herman, the same attorney who represented Michael Egan in his suit against Singer a couple years ago, filed the lawsuit.
Because of the alleged incident, Guzman says he suffered emotional distress, mental anguish, and physical and mental pain.
It is now unclear whether or not Twentieth Century Fox, the studio behind Bohemian Rhapsody, knew about the allegations outlined in the new lawsuit.