One is in the biggest pop band in the world, the other is in one of the biggest pop punk bands. Both are incredibly cheeky. It's time for the Harry Styles and Alex Gaskarth GIF battle to begin!
Let's have a clean fight, boys. We don't want to see any blood. Bitch slaps and nipple wrenches only, okay?
Battle stations at the ready!
Round One: Best Blowing Kisses
Round 2: Best Strike A Pose
Round Three: Cutest Band Bros
It's your vote that will decide the winner!