Shawn Mendes and Justin Bieber's new single "Monster" has been years in the making and it did not disappoint

I’ve always found it weird how Shawn Mendes and Justin Bieber have rarely crossed paths — at least publicly. Justin was already a megastar by the time Shawn even stepped onto the scene, but in my head these two princes of pop, who grew up down the highway from each other, should have been buddies fr...