Millions of people across the world will watch the One Love Manchester concert this evening.
The gig organised by Ariana Grande is going ahead despite the London terror attack, and will be broadcast live in more than 50 countries.
Praying for London ♡
— Ariana Grande (@ArianaGrande) June 4, 2017
Ariana's agent Scooter Braun says all the artists involved feel a responsibility to honour the victims of both atrocities.
In a post on Instagram, he says: 'We must not be afraid, and in tribute to all those affected here and around the world, we will bring our voices together and sing loudly'.
See you soon pic.twitter.com/LVOSJszZTr
— Justin Bieber (@justinbieber) June 4, 2017
Proceeds from tonight's gig will go towards supporting grieving families and victims of the Manchester Arena terror attack.
22 people died after a suicide bomber targeted Ariana's concert at the venue on May 22nd.
The singer will be joined on stage by a host of stars including Katy Perry, Niall Horan, Miley Cyrus, Justin Bieber, Take That, Coldplay and Robbie Williams.
thoughts are with the people of London today after yet another horrific attack .
— Niall Horan (@NiallOfficial) June 4, 2017
The gig will be broadcast live on BBC One from 6.55pm and will be available to watch on demand via BBC iPlayer.