Shawn Mendes has debuted a new song.

The singer is releasing the track 'Believe' from the soundtrack of upcoming Disney film Descendents.

Plugging the song on Twitter overnight, Mendes wrote:

"EVERYONE go get my song #Believe that I wrote for the #DisneyDecendants movie now on @itunes."

Descendants meanwhile will air in the US on July 31.

Its soundtrack will be released in the country on the same day.

The movie will "explore the teenage lives of the children of some of Disney’s greatest villain characters as they attend prep school with the kids of Disney heroes and royals".

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Listen to 'Believe' below: