The star allegedly refused to go topless in The Canyons, but changed her mind after requesting all ten of the male crew to also strip off.
A source told TMZ: "The crew was hesitant at first. They eventually obliged and it all went off without a hitch."
Despite her reported shyness on set, Lohan has posed nude for Playboy and is often seen out in public without wearing a bra.
The Canyons deals with the subject and dangers of sexual obsession and ambition among a group of young people living in LA. Lohan co-stars in it with porn actor James Deen.
The film is based on a screenplay by Bret Easton Ellis, a writer well known for the novel American Psycho.