Katy Perry jokes about Justin Bieber's YouTube trawl during his Coachella set

Katy Perry made a hilarious joke during Justin Bieber's Coachella set. Justin took to the stage for his first-ever headline performance at the festival, but it wasn't a typical set. Instead of a polished show, he appeared to be working off his laptop in real time, scrolling through YouTube to pull up his tracks. While he was searching for songs, Katy reacted from the audience to the moment with the joke.