Piers, 55, had previously mocked Lady Gaga, 34, for attending a WHO conference held to discuss the ongoing coronavirus pandemic.
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At the time, the outspoken Good Morning Britain star said: "Why? Has she found a cure? Otherwise, we don’t need a bloody singer there."
But Gaga – real name Stefani Joanne Angelina Germanotta – went on to help organise the One World: Together At Home live stream concert, which was held on Sunday night (BST).
Lady Gaga opened the concert, which saw at-home performances from huge stars including Sir Elton John, The Rolling Stones and Jennifer Lopez – and it has raised more than $127 million (£100 million) for the fight against Covid-19.
Taking to Twitter, Piers has now told Gaga: "I owe you an apology @ladygaga – this was a great initiative that raised a fortune, entertained people, & will help save lives.
"It was also a perfect illustration of a major star using their profile properly in this crisis. Congrats & sorry for originally questioning it."
Piers has since been supported by his fans for holding his hands up and apologising to the American singer.
One wrote: "In hard times like these he is a people’s person and that is all it matters."
Another commented: "Takes a strong man to admit he made a mistake. That’s character!"
Lady Gaga opened Sunday night's live-stream concert with a performance of Nat King Cole's song Smile.
Sitting behind an electric piano in her home, Gaga said: "Today I’m so happy that we are one world, together at home.
"I feel very honoured to be a part of the World Health Organisation and Global Citizen in the fight against COVID-19 and raising money for the Solidarity Response Fund.
"I care so much for all of the medical workers who are putting their lives at risk for us right now. I think of them every day and pray for them every day.
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"And I’m also thinking of all of you that are at home, who are wondering when this is all going to be different.
"What I’d like to do for you tonight, if I can, is just give you the permission to, for a moment… Smile."
Gaga has since tweeted: "Thank you with all of my heart for watching #TogetherAtHome, sharing in a global moment of kindness with each other, and spreading positive and loving intentions. We love you."
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