The 55-year-old presenter proudly shared the news with his 7.6million followers on Twitter today (June 23).
Posting a snap of himself and co-host Susanna Reid on the show, Piers wrote: "BREAKING: Good Morning Britain hit a new all-time ratings high yesterday - 27.5% audience share, 1% higher than ever before.
"The more people attack or boycott us, the more viewers we get. Keep going haters."
Viewers were quick to praise their efforts, with one saying: "To be fair that is pretty impressive!"
Another wrote: "So well deserved. Congrats to all the team."
A third added: "Keep at them Piers and Susanna, get the truth and show how truly incompetent the government really is!!!"
More good news
The news is yet another feat for Piers and the team after GMB became the highest rated ITV show for the first time ever last week.
The controversial presenter beat the likes of This Morning's Holly Willoughby and Phillip Schofield to the top spot.
Piers shared a similar post with his followers, saying: "BREAKING: For the first time ever, @gmb was ITV's highest-rated show (25.5% audience share) yesterday across the whole day/night."Thanks for watching and thanks to our brilliant editorial and production teams for all they've done during this pandemic."
Not backing down
The host has drawn a fair bit of controversy for his confrontational style of presenting during the global pandemic, having received over 4,000 Ofcom complaints so far this year.
Last month, he hit back at those complaining about him to the broadcast regulator as he revealed he has renewed his contract with GMB.
In a chat with The Sun's TV Mag, Piers explained: "I've just signed a new contract up for GMB until the end of next year. I love working with Susanna and the team – we're a Yin/Yang that works."
He added: "If my style upsets people, don't watch! Watch something else. Nobody's forcing anyone to watch it. You've got a remote control in your hand, I really don't understand what the problem is.
"I don't care. I only care about Ofcom complaints if I genuinely feel that I have been at fault, then you know you're a fool."
Piers wracked up a number of complaints after his no-holds-barred interviews with MPs Helen Whately and Tobias Ellwood.