Will Arnett

Will Arnett arrives at the Hollywood premiere of "Nacho Libre" held at Grauman's Chinese Theatre on June 12, 2006.

Will Arnett arrives at the Entertainment Weekly Emmy Pre-Party at the Cabana Club in Hollywood on Sept. 17, 2005.

Robin Williams, Cheryl Hines, director Barry Sonnenfeld and actor Will Arnett pose at the premiere of Columbia Pictures' "RV" at the Village Theater in Los Angeles on April 23, 2006.

Will Arnett attends the Cloak Fall 2006 fashion show during Olympus Fashion Week in New York on Feb. 7, 2006.

Will Arnett poses with his wife, Amy Poehler, as he arrives to attend the closing ceremony of the 45th Television festival of Monte Carlo on June 1, 2005.

Will Arnett poses during a photo call at the 45th Television festival of Monte Carlo.

Mitch Hurwitz, Tony Hale, actors Jason Bateman, Will Arnett and producer John Levenstein attend Fox's 56th Annual Primetime Emmy Awards Gala at Spago in Beverly Hills on Sept. 19, 2004.

Michael Cera, executjve producer David Nevins, actors Will Arnett and Alia Shawkat pose at a cocktail party and script reading for Fox's "Arrested Development" at the Wadsworth Theater in Los Angeles on Aug. 13, 2004.

The cast of "The Mike O'Malley Show": Clockwise from top left: Missy Yager (Shawna), Mike O'Malley (Mike O'Malley), Will Arnett (Jimmy), Kate Walsh (Marcia), Mark Rosenthal (Weasel) and Kerry O'Malley (Kerry O'Malley).