Rogen didn't tone down for Barbra

Seth Rogen has revealed he refused to tone down his dirty sense of humour for Barbra Streisand.

The Knocked Up funnyman stars alongside the award-winning actress and singer in mother-son comedy The Guilt Trip, which follows an inventor and his mother as they embark on a cross-country road trip.

Seth told movie blog TheHotHits.com: "I made a choice very early on not to censor myself in front of her, just because I'll see if she can just handle it. And she totally did. It didn't faze her for a second. She's known much dirtier people in her life, I would imagine."

Barbra agreed: "That's true!"

Meanwhile, it has been announced that Seth will guest star in an episode of Fox comedy The Mindy Project, as Mindy's long lost lover from summer camp.