If one thing's for sure, it's that Justin Timberlake and Anna Kendrick aren't slacking. 

On Monday, the stars teamed up with Anderson .Paak in the music video for "Don't Slack," which is featured in their new movie Trolls: World Tour. In it, Justin and Anderson do their best to cheer up Anna, who appears to have woken up on the wrong side of the bed...literally.