Plus, Sia will voice a character named Half Oracle in the animated musical comedy.

Credit: Kevin Winter/Getty Images

Sia and Patrick Stump will lend their music talents to Charming, an animated musical comedy about three princesses who discover they are all engaged to the same Prince Charming.

The “Chandelier” singer has written two songs for the film, one of which, “Balladino,” she will perform herself. The other track, “Magical,” will be performed by Demi Lovato, who stars in the film as Lenore and is its music score executive producer. Sia will also voice a character named Half Oracle.

“I am thrilled to welcome my friend and hero Sia to the movie,” Lovato said in a statement.

The Fall Out Boy frontman, meanwhile, will write and co-produce the song “Trophy Boy,” which will be performed by Avril Lavigne, Ashley Tisdale and G.E.M., who are playing Snow White, Cinderella and Sleeping Beauty, respectively, with Wilmer Valderrama voicing the bad-boy Prince Charming.

“From our first meeting it was our goal to make Charming an animated film that makes a profound impact on pop culture with its music,” said Valderrama and producer John H. Williams in a statement. “It is clear that with Demi, Avril, Ashley, G.E.M. and now the incredible Sia and Patrick, that we are well on our way to accomplishing that goal.”

Charming, from 3QU Media, is written and directed by Ross Venokur.