Ariana Grande and Justin Bieber have teased a "special announcement," leading fans to speculate they may be working on new music together.

Ariana Grande and Justin Bieber tease ‘special announcement’

Ariana Grande and Justin Bieber tease ‘special announcement’

Canadian pop singer Bieber was first to share the news, promising to reveal all at 6pm on Friday.

Grande quoted the tweet and wrote: "See u there everybody."

To add further intrigue, Scooter Braun, who manages both stars, tweeted them both with the looking eyes emoji.

While neither Grande or Bieber shared any further detail, they posted similar pictures to Instagram.

Bieber posted a picture of the famous CN in Toronto, surrounded by fog.

Grande shared a snap of Los Angeles, also covered in fog.

Fans speculated the announcement could involve the pair teaming up for new music.

The pair recently joined other artists at Universal Music Group, including Billie Eilish and The Weeknd, in releasing reusable cloth face masks as part of the We've Got You Covered project, with donations going to the coronavirus relief effort.