See All the Best Moments from Ariana Grande's Star-Studded Manchester Benefit Concert

Ariana Grande and Miley Cyrus sang a cover of "Don't Dream It's Over"

Pharrell Williams and Miley Cyrus performed "Happy"

Niall Horan performed "Slow Hands" and "This Town"

Take That briefly reunited with Robbie Williams onstage. However, the two performed separately, not together.

Little Mix performed

Miley Cyrus and the Black Eyed Peas watched Ariana Grande perform

Marcus Mumford opened up the show with "Timshel"

Justin Bieber fought back tears after performing two songs, "Love Yourself" and "Cold Water"

Ariana Grande opened up her set with "Be Alright"

Katy Perry danced around the stage while performing "Roar"

Ariana Grande joined the Black Eyed Peas to perform "Where Is the Love"

Ariana Grande performed "My Everything" with a school choir

Miley Cyrus sang "Inspired"