"I expected better from her," he initially wrote.
#RUDE.
Now, after Ari held the benefit concert over the weekend, Piers has officially eaten his words and actually apologised.
Now that's something new for him...
"I misjudged you, @ArianaGrande & I apologise. You're an admirable young woman & this is a magnificent night. Respect.#OneLoveManchester," he wrote on Twitter shortly after the concert concluded.
The concert saw amazing performances from the likes of Miley Cyrus, Niall Horan, Justin Bieber and more, raising over $12 million with the 'We Love Manchester Emergency Fund,' with $2.5 million coming from the text and online donations during the show.