Brad Pitt and Matt Damon will voice characters in 'Happy Feet 2'.
The acting pair - who last starred together in 'Ocean's 13' - have both signed up to star in the animated movie, which follows a group of singing penguins, and are reportedly recording their voice parts this week.
Both Elijah Wood and Robin Williams, who voiced characters in the first film, released in 2006, will return for the sequel, as will director George Miller, who plans to shoot the movie in 3-D.
Matt - best known for his roles in action movies - has recently put a lot of practice into voice training for the film 'Invictus', in which he plays 1995 South African rugby captain Francois Pienaar, because he worried he would sound "like Frankenstein" if he didn't put in a lot of effort altering his voice.
He said: "Worked hard on the accent and on training physically to build myself up to try to pull off the illusion of being the captain of a South African rugby team.
"The dialect coach and I talked a lot about how a lot of people, when they do a South African accent, really overdo it and end up making somebody sound like Frankenstein."
'Happy Feet 2' is set for release in November 2011.
Actress Brittany Murphy - who died last month - was part of the cast of the original movie.