"I'd never done an action movie, I'd certainly never done an action comedy, so it was a great opportunity to try something new," Witherspoon says.
"This Means War" also stars Chelsea Handler, who despite her popularity, says film roles aren't coming her way.
"No one was asking me, Reese asked me to do it. I was like 'Sure, yeah I'd love to,'" Handler says. "Of course I wanted to work with Reese because she doesn't make a lot of bad movies. She doesn't make any bad movies, so I wanted to do that. Plus it's me just playing myself, it's not like I'm doing any heavy acting here."
Amy Poehler lends her voice along with Carol Burnett in "The Secret World of Arrietty." Amy got the chance to tell the comedy legend just how much of an impact she's made.
"Her show was the influence for me as far as a young person in comedy. I have such fond memories of growing up with it, and when you watch Carol's show you felt like you knew her," Poehler says.
The movie was originally released in Japan before being picked up by Disney and revoiced by the all-star cast.