06/23/2011 07:20 am ET | Updated Aug 23, 2011

Cameron Diaz & Justin Timberlake's Sex Scene In 'Bad Teacher' Was 'Uncomfortable'

Once a couple in real life, Justin Timberlake and Cameron Diaz are now costars in Bad Teacher -- which contains what the comedy's director Jake Kasdan tells PEOPLE is the "most uncomfortable sex scene in history."

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