Ariana Grande threw her One Love Manchester Concert yesterday to pay tribute to the victims of the terrorist attack on May 22nd. So yesterday, the Manchester Arena was absolutely packed with eager fans wanting to see her, her boyfriend Mac Miller, Justin Bieber, Katy Perry, Miley Cyrus, Pharrell and many more.

And fans were in for quite a special concert as there were tons of special performances. One of those highlights occurred during Pharrell's set thanks to a familiar face. Pharrell and Miley Cyrus worked together a few years ago for "Come Get It Bae."

But yesterday when Miley joined Pharrell on stage, it wasn't to perform that track. In fact, she joined him on stage to deliver an absolutely amazing collaborative rendition of his hit "Happy." Watch the magic of this amazing collaborative performance below.