Ariana Grande's star studded "One Love Manchester" concert kicked off without a hitch yesterday, even on the heels of yet another terrorist attack the day prior, this time on London Bridge. Ariana said speaking of the event: "This is the Medicine the world needs." And it truly was! The event included heart felt performances from artists like: Justin Bieber, Coldplay, Katy Perry, Little Mix, Miley Cyrus, Pharrell Williams, Niall Horan, Take That, Black Eyed Peas, and Robbie Willams. Check out the recap video below.