Pink realised she had "nothing to fear" after hearing Brad Pitt and Matt Damon sing in their new movie.

The stars all lend their voices to the new animation Happy Feet Two. Pink plays soulful penguin Gloria, and the character performs several songs during the sequel.

Even though Pink is best known as a singer, she was terrified before recording her part. However, she soon felt at ease when she witnessed her co-stars belting out a tune.

"I got to watch Brad and Matt not only record some of their dialogue, but they also had to sing," she revealed while promoting the movie. "They just went for it, and I thought, Wow, I really have nothing to fear in there.'"

Brad and Matt voice the characters Will the Krill and Bill the Krill respectively.

The pair were happy to throw themselves into the script, even though they aren't the greatest musicians.

"The singing was a bit of a surprise," Matt admitted. "It was fun to just go for it and say, What the hell?' It's definitely not my strong suit, but I figured, you gotta go loud or go home."

Happy Feet Two also features the voices of stars including Elijah Wood, Robin Williams and Hugo Weaving.

The family comedy is released worldwide from this week.