The Teen Choice Awards was a star-studded affair on Sunday night, but no one shone brighter than the cast of Riverdale. In addition to taking home 10 awards, including choice drama TV show, the cast looked like one big family as they walked the red carpet and joked around with each other inside. As onscreen and offscreen couple Cole Sprouse and Lili Reinhart posed for a sweet photo at their seats, their costar KJ Apa hilariously photobombed them in the background. Seriously, when you see his face, you'll do a spit take. See even more fun moments from the cast's big night ahead.