The family lit 22 candles on a grand piano for the children and adults killed when the bomb was detonated.
It features a bee, a symbol of Manchester, behind her left ear and just above her moon tattoo.
And two days after the anniversary the 24-year-old shared a picture on Twitter of the back of her head where a small bee tattoo can be seen with the caption "forever". Less than a month after the attack, she organised a benefit concert, One Love Manchester, to aid the bombing victims and affected families.
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In June 2017, PRI reported that many Manchester residents showed their solidarity with the victims and survivors of the devastating bombing by getting the bee tattoo. In the aftermath of the tragedy, Grande, fans, and people around the world came together in support.
It's not the first time Grande has paid tribute to the people of Manchester.
The Saturday Night Live star, 24, also left a bee emoji, along with a heart and heart-eyes emoji.
Grande tagged the tattoo artist in the photo, who posted a color shot of the ink, giving us a closer look at the bee with wings in the shape of a heart. Ariana has followed suit and captioned her post "forever".