The Big Lebowski star has been in many well-known movies including The Borrowers, The Flintstones and television show Roseanne, but he was still unsure of himself when he wanted to meet Bridesmaids actress Kristen at a party.

He was attempting to introduce himself to her for the first time but picked the wrong moment, when she was in conversation with someone else, and the embarrassing moment has put him off chatting to her in the future.

"She was talking to somebody else, and I was just – I think she's so great, and the social barriers broke down and I interrupted the conversation," he tells radio DJ Howard Stern. "And I would just hate for somebody to do that to me. And she goes, 'yeah, I'll talk to you in a minute...' "

He made the sound of a bomb dropping and continued, "It was like the Atom. I shrunk down to Atom size. I really like her, and it was embarrassing, so I'll never speak to her again."

Kristen is not the only star to leaving him feeling inadequate - he chose not to hang out with George Clooney and Matt Damon during downtime on their 2014 movie The Monuments Men because he doesn't really enjoy partying.

“I tried to hang with them, but Matt and George would always have these conversations, and they’d go out for cocktails afterwards and I don’t really drink, and I don’t bring a lot to that party because they’re super A-level guys," he said.

He spent most of his time time with co-star Bill Murray, with the pair cycling around on bicycles and getting lost. He recalls, "We’d just go get lost, and they had to send guys in cars out to look for us, and to make sure Bill’s not gonna go over any borders or cause any trouble."