The Dumb and Dumber actor has been linked to playing the role of Colonel Stars in the comic book movie sequel, after he revealed he was a fan of Matthew Vaughn's first film.
Wadlow tweeted that they have now cast the Colonel, saying: "6 days till we start shooting... and we officially have our Colonel. Alrighty f'n then! @ChloeGMoretz @MintzPlasse @donald_faison #kickass2."
Christopher Mintz-Plasse replied, asking who they had signed to play the part, to which the original comic book writer Mark Millar hinted further at Carrey's appointment.
"Clue - he lives with 200 raccoons and parrots, owns the mask of Loki and named by spielberg as a genius," he wrote.
Aaron Taylor-Johnson, Chloë Moretz, Christopher Mintz-Plasse and Nicolas Cage will reprise their original roles for the sequel.
Lyndsy Fonseca, Yancy Butler, Donald Faison, John Leguizamo, Lindy Booth and Andy Nyman have also joined the cast.
Kick-Ass 2 will be released in the US on June 28, 2013 and the UK on July 19, 2013.