Justin Bieber has been working in the studio with Pharrell Williams.

The Canadian revealed the news on Twitter as he continues to create fresh material.

The 'Believe' man said: "Fun night in the studio with big bro @Pharrell . #greatguy."

Bieber added: "About to hit one more session. #music #art #focused. Do what u love. Love what u do."

The singer meanwhile recently tweeted that fans should "expect the unexpected" when it comes to his future plans.

The 'Boyfriend' star has long been teasing new single 'Heartbreaker' but there is still no official release date revealed. Watch Justin Bieber perform live below: