Christina Applegate's swearing struggle

Dec 31, 2009, 13:05 GMT

Christina Applegate struggles not to swear.

The US actress - who battled breast cancer in 2008 - said she had to make sure she never went off script at any point during voicing a character in 'Alvin and the Chipmunks: The Squeakquel' - where she plays a member of the Chipettes, a singing group which gives the titular chipmunk gang serious competition.

She said: "We're strictly PG all the way. When I improvise, foul things often come out of my mouth that aren't on the page.

"So I really stuck to the script or there would have been some inappropriate words from my chipmunk. It was good to do something that was very wholesome.

"I don't have any children, but I'm happy that I didn't have to say anything disgusting in 'The Squeakquel' that would shock kids."

Christina, 38, also said mastering the high-pitched voice of her character took a surprising approach to get the right sound.

She explained to Parade.com: "You have to talk really slow like you just kind of had woken up from a nap. It's really funny because it's as far away as you can get from that chipmunk sound. Then, you hear it sped up and it's perfect."