After months of rumors, AICN now carries confirmation that British stars Simon Pegg and Nick Frost have been cast as the detective duo Thomson and Thomson in Tintin.

The pair join Andy Serkis as Captain Haddock, though the main character himself remains to be cast. Steven Spielberg is directing the 3D, $135 million CG motion-capture film that will be based on the two-part “The Secret of the Unicorn” and “Red Rackham’s Treasure” books by Herge.

The Thomson twins are the comic relief in the series. They have a subplot in the above books, dealing with a kleptomaniac who has been lifting wallets from all around town.

The first installment is due out 2010.