Selena Gomez, Shailene Woodley, Tyler Posey and 5 Seconds of Summer
Best: Tyler Posey
Sarah Hyland was the official co-host, but "Teen Wolf" star Tyler Posey's energy pretty much took over every time they hit the stage. Sure, he name dropped a couple of the presenters as "one of my best friends" a few too many times. Sure, he's not naturally funny enough to ad lib a joke or two. That being said, he thoroughly entertained a blushing Jennifer Lopez, through on a coconut bra and kept a show with almost no pre-packaged material moving as quickly as possible. Give him 10 years and we might have a real pro on our hands.