Hollywood stars Matt Damon and Mark Wahlberg have formed a pact to be nice to each other's fans as moviegoers often confuse the two actors.

Wahlberg hit headlines last year (13) when it emerged a fan approached him in a street and asked for a photograph, thinking he was Damon.

He obliged and later made light of the incident by linking to the image on his Facebook.com page alongside the cheeky message, "Close enough."

Now Good Will Hunting star Damon has revealed they are often mistaken for each other, but have agreed to play along when approached by confused fans.

He tells U.K. talk show host Graham Norton, "I get confused with him all the time. We talked about it years ago because it kept happening. We have a deal. And the deal is, if you're mistaken for the other guy you have to be extremely polite. I can't ruin his name, so when I'm Mark Wahlberg I have to be on my best behaviour!"

Downton Abbey star Hugh Bonneville, who is also a guest on this week's (ends14Feb14) show, reveals he is also often mistaken for other famous faces - including Diana, Princess of Wales' former butler Paul Burrell.

He says, "There is a confusion. In my younger days, when I had cheekbones, it was Colin Firth and latterly it's Paul Burrell!"

The show is due for broadcast in the U.K. on Friday (14Feb14).