The Croods stars Emma Stone and Ryan Reynolds cringe at the sound of their own voices

They've both helped make millions at the box office and are two of Hollywood's most sought after talents, but The Croods voice stars Ryan Reynolds and Emma Stone say they still get self-conscious hearing themselves on film.

"It's like hearing your voice back on a voicemail," said the 24-year-old Stone, who is known for her trademark raspy voice. "I still can't believe I sound like this."

"I can't believe you sound like this either," joked the 36-year-old Reynolds in the same recent interview. He went on to confess that "everyone feels that way — like there's some solace in that. I think everyone feels like that when they hear their own voice. (It sounds) kind of shrill and brutal."

They're going to have to get used to it. The animated Croods opened today amid predictions it will be the weekend's No. 1 movie.

The 3-D film, which also stars Nicolas Cage, takes place in prehistoric times and focuses on the world's first family, the Croods. Stone is a teen girl named Eep, who longs to leave her cave and see what's out there. Her father, voiced by Cage, is overly protective. One day they meet a guy... named Guy, played by Reynolds. The Croods and Guy venture out together and learn about the world.

This is the first time Reynolds and Stone have done an animated movie and they hope it rates with some of their own childhood favorites.

Reynolds says he was a fan of the TV show Thunder Cats and adds Smurfs was pretty good, too. "Not a turn on but a good cartoon nonetheless."

Stone's animated faves? "I loved 'Peter Pan' and 'Alice in Wonderland."'

AP