Ariana Grande's manager, Scooter Braun, introduced the singer with a moving speech.
A beautiful end to the night.
'I won't let go of hope,' the 'Purpose' singer said.
Williams, Mumford and Cyrus came together on stage during Ariana Grande's One Love Manchester benefit concert on Sunday.
Marcus Mumford opened the concert with a moment of silence, followed by a powerful performance of 'Timshel.'
Is that an engagement ring we spy?
The 'Dangerous Woman' singer made her return to Manchester two weeks after the attacks.
'All we feel tonight is love, resilience and positivity,' the 'Happy' singer said.
Stars are sending their love to London after reports of several attacks around the city.
The 44-year-old actor made a rare public appearance on Saturday night.
The British musician opened the benefit concert with a moment of silence.
EXCLUSIVE: Ariana Grande to Duet With Boyfriend Mac Miller at Manchester Benefit Concert
'The Perfect Soulmate' airs Sunday, June 4 at 8 p.m. ET/PT on Lifetime.
The 'One Love Manchester' benefit concert will continue as planned on Sunday.