“I met Brad Pitt at the BAFTAs!” he told the BBC.
“I was sitting behind him actually, we were just finding our chairs and I just said, ‘Good luck tonight.’ And he was like, ‘Hey man, I loved your film, we’ve seen it like four times.’
"And I was like ‘we’, that’s probably you and Angie, sitting down with a pint of warm milk.”
The Irish star, who has seen his status rise following his portrayal of dashing cop Officer Nathan Rhodes in 2011's box office hit Bridesmaids, admitted that being called a 'sex symbol' takes some getting used to.
"I wear that status like a hair vest. It's very fleeting and it's been fun but I'm ensuring that all the characters I play from now on are pretty despicable. I can't be dealing with all that nonsense, because it's not real," he quipped.
Chris, who married TV presenter Dawn Porter in August, began to garner a following in the US with appearances in Dinner For Schmucks and Gulliver's Travels, but Bridesmaids really got him noticed.
The 33-year-old is collecting encounters with Hollywood A-listers, which are evidence of his recent rise to stardom.
"I met Clint Eastwood and he told me he liked my film. I'm still not convinced that he had any idea who I was, and he was just playing it cool, but nonetheless there was a fleeting moment where I took him at his word," he recalled.
The former IT Crowd star has also met the Duke and Duchess of Cambridge, Prince William and his wife Kate.
"I met William and Kate recently and they'd watched Bridesmaids a week after they married," he revealed.
"There's a picture that somebody gave me at my wedding of myself and Dawn talking to Kate. It's a good one. I had clearly told a big joke that they're laughing at," he added.