Check out their Monster music video.
If you're a huge fan of Justin Bieber AND Shawn Mendes, then get excited because they have teamed up to bring us a new single... Monster.
The pair released the raw and honest duet based on their shared experience as child stars growing up in the public eye.
The Biebs posted his thanks on being included on the track.
It's a Monster of a song... and we are totally picking up what they're putting down!