Actress Jennifer Aniston enjoyed a brief, secret romance with her co-star Charlie Schlatter while they were filming a Tv adaptation of film classic Ferris Bueller's Day Off, according to former set assistant-turned-magazine editor Jim Nelson.

Nelson, who now serves as Editor-in-Chief of America's GQ, reveals he used to be an assistant for one of the show's comedy writers in 1990 and discovered Aniston had become involved with her onscreen brother Schlatter, who tackled the title role made famous by Matthew Broderick.

In a piece for the new edition of Gq, he writes, "To Aniston worshippers, I can offer little dirt.

"She was lovely, kept to herself on the set, smoldering a bit like her outraged character, 17-year-old Jeannie Bueller. She was a brunette then, with none of (her Friends character) Rachel Green's bob or self-possession.

"Gq can exclusively report that everyone on set thought she was hot, including Schlatter, with whom she had a brief, torrid romance - while playing, it must be said, his older sister. To we immaturions on the show, this seemed extra-hot. Like performative incest."

The romance and the Tv series didn't last - Ferris Bueller was axed midway through its first season, but Aniston went on to land her big break on Friends in 1994.

She is now engaged to actor Justin Theroux, while Schlatter is now a married to Colleen Gunderson.