Keira Knightley revealed one of her strangest auditions on the Gramm Norton Show. (Photo: Getty)

Keira Knightley revealed one of her strangest auditions on the Graham Norton Show. (Photo: Getty)

Keira Knightley has made bad on-screen sex an art form. She revealed on the UK’s Graham Norton Show yesterday (June 14) that a famous director once asked her to make “weird sex faces” for a movie role.

The Director was David Cronenberg, who is known for working with Twilight’s Robert Pattinson.

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He was casting at the time for his movie “A Dangerous Method.”

“He wanted to see my planned weird sex faces…” Kiera revealed about the audition, which took place over Skype.

“It was horrible on every level, because I’d never met him before,” she recounts.

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Knightley, 29, starred in the 2011 movie with Viggo Mortensen and Michael Fassbender.

The movie was about the clash between 20th Century doctors Carl Jung, founder of analytical psychology, and Sigmund Freud, who pioneered psychoanalysis.

Keira played Sabina Spielrein, who was a patient of Jung’s because of her unusual sexual fetishes.

Norton broached the subject when he asked what Kiera would consider worse, singing in front of a large audience, or doing her sex faces.

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“Right now?” Keira replied.

Check out her response below, let us know your thoughts and be sure to follow TheImproper on Twitter for the latest celebrity news.