Usher Talks on Why He Missed Ariana Grande's One Love Manchester Concert

That is the question many fans were asking on Twitter Sunday after he was M.I.A. at One Love Manchester, Ariana Grande's charity concert that raised $3 million for victims of the Manchester Arena bombing that took place on the 22th of May Last week, a press release said Usher would be taking the stage in addition to Justin Bieber, Coldplay, Miley Cyrus, Niall Horan, Katy Perry, Take That and Pharrell Williams. Additional performers, like Black Eyed Peas and Little Mix, were added later on, while Noel Gallagher and Imogen Heap gave surprise performances.

Though Usher promoted the concert on social media, he never took the stage—and he did not reveal why until Monday. Reaching out to his 6.5 million Instagram followers, the 38-year-old Crash" musical icon shared a photo of Grande singing on stage, writing, "So happy to see that last night's concert in Manchester proved that love always prevails. I would have loved to be there but it was my son's first day at Camp Kudzu, one of the very few summer camps for kids living with diabetes. This was an important day for son and for myself as a proud father. Stay strong UK."

Funds raised will benefit the We Love Manchester Emergency Fund, which was set up by the city council and the British Red Cross. Ticketmaster set aside 14,000 free tickets for those who attended the May 22th concert. The remainder of the tickets for the show at the Emirates Old Trafford Cricket Ground—which has a capacity of about 50,000—sold out in under six minutes.

The British Red Cross confirmed that over $12 million has been raised since May 23.

During Sunday's concert, Grande asked a local children's choir to help her sing "My Everything," the title track off her second album. The pop star capped off the star-studded event with an emotional, powerful cover of Judy Garland's signature song, "Somewhere Over the Rainbow."

Grande performed "One Last Time" toward the end of the concert and will re-release the song as a charity single, with all the proceeds benefiting the We Love Manchester Emergency Fund. Her Dangerous Woman tour, which was suspended after the attack, is going to resume June 7 in Paris.