British movie star Ralph Fiennes is at the center of a mile-high sex scandal after he allegedly became amorous with an Australian flight attendant during a long-haul flight.

A 38-year-old Qantas stewardess has been suspended and could lose her job after fellow crew members allegedly spotted her and Fiennes leaving the same aircraft toilet cubicle moments apart, The Sunday Telegraph said.

In a statement lodged with her employer and obtained by the paper, Lisa Robertson said the actor had become "amorous" with her after the pair chatted together during a flight from Australia to India late last month. But she denied having sex with the 44-year-old star of The English Patient and Schindler's List.

"While conversing with Mr Fiennes during my break, I expressed a need to go to the toilet," Robertson said in her statement. "I went to the nearby toilet and entered it, he followed me and entered the same toilet.

"I explained to him that this was inappropriate and asked him to leave. Mr Fiennes became amorous towards me and, after a short period of time, I convinced him to leave the toilet, which he did. I left the toilet a short time later."

A Qantas spokesman confirmed that a flight attendant had been stood down.