To mark the anniversary, scores of fans came together to hold a vigil, which saw them singing Ariana's latest single No Tears Left To Cry.
She wrote: 'So wish i were there with u all today. u have no idea. love you so v much'.
The sold-out One Love Manchester show on June 4 at the 50,000-capacity Emirates Old Trafford cricket ground in Greater Manchester included Justin Bieber, Black Eyed Peas, Coldplay, Miley Cyrus, Niall Horan, Katy Perry, Pharrell, Take That and others, raising more than $3 million for the British Red Cross' We Love Manchester Emergency Fund. The fans were victims of a terrorist who detonated a bomb in the foyer of the venue as concertgoers filed out of the arena after Ariana's gig.
Tony Walsh's poem This is the Place, which he memorably read aloud outside Manchester Albert Square past year, was then recited by Louise Sharrock Sivill.
So far, Ariana has not yet posted anything about the bombing on her popular Instagram account, but perhaps she will by the end of the day.
"Seeing how everyone reacted made me so proud to be a Mancunian".
Earlier Manchester came together in an emotional day of remembrance, with 800 people attending an afternoon commemoration service at Manchester Cathedral while a one-minute silence - observed nationwide - was held at 2.30pm.
People laid flowers and cards in St Ann's Square, which became a focal point for mourners after the attack. The singer returned to Manchester two weeks later to perform at an all-star fundraising concert.
Among the dignitaries present were the Duke of Cambridge, Prime Minister Theresa May, Labour Party leader Jeremy Corbyn, First Minister of Scotland Nicola Sturgeon, Lib Dem leader Sir Vince Cable, Greater Manchester Chief Constable Ian Hopkins, Greater Manchester Mayor Andy Burnham and Sir Richard Leese, the leader of Manchester City Council.
Bells will ring out across the city center at 10:31 p.m.to mark the exact moment of the explosion past year.