Colin Farrell appears on David Letterman

Hollywood hunk Colin Farrell turned David Letterman's late night chat show into a late night HAT show.

The pair joked about wearing matching fedoras as the Irish actor appeared on the show to promote his new movie 'In Bruges.'

"How much did you pay for that hat?" Letterman said, before going to an ad break. When cameras returned the pair both posed in the matching hats before cracking up with laughter.

In his new movie the 'Miami Vice' star plays an Irish hit-man hiding out in Bruges, Belgium, after a job goes horribly awry. Farrell said he spent 10-weeks in the city filming - which he admitted was more than enough.

He said: "It's a gorgeous city but we were there for 10-weeks and I don't know if the beauty can sustain you that long!

"It's very picturesque, it's a fairytale city but it's quiet. We got there and it was the middle of winter, by 4 in the afternoon it was pitch dark and nobody was on the streets.

"I thought the plague had hit town."

Letterman said after seeing the movie all he wanted to do was go to Bruges.

Farell quipped: "We'll off you go Dave!"