United Kingdom, Aug. 27 -- Steve Carell and John Krasinski crashed The Paper set on the first day of filming.

The Office US stars - who played Michael Scott and Jim Halpert respectively on the US version of Ricky Gervais' iconic mockumentary sitcom - surprised the cast of the upcoming spinoff series as they were preparing for the first shoot.

Actress Sabrina Impacciatore told Entertainment Weekly: "No makeup yet. We are very anxious. Like, oh my God, we're so scared. And then we hear, knock, knock.

"Someone enters the trailer, and it's Steve Carell and John Krasinski! We're fainting. Like, what?

"Can you imagine? Isn't it crazy? The first day of shooting!"

The duo were working on a commercial for Italian coffee brand Lavazza when the...