The Duchess of Sussex and Prince Harry marked the one year anniversary of their marriage by sharing a series of previously unseen images on Instagram.
They captioned photos: "Thank you for all of the love and support from so many of you around the world. Each of you made this day even more meaningful."
However, in a piece for the Mail Online, Piers hit out at the royal couple and accused them of behaving like reality TV stars.
"I don’t know what’s really going on in the reportedly feuding Palace life of the Duke and Duchess of Sussex and the Duke and Duchess of Cambridge, but I do know they’re behaving like they’re in a royal reality TV show where the winner gets most press coverage in a short period of time,” he wrote.
"Leading the charge, naturally, is the Hollywood actress who seems to view publicity as a giant tiara-adorned tap from which she wishes to determinedly control every single droplet.
"You’d think Meghan might have cooled the self-promoting jets after the recent birth of son Archie, given how much attention it attracted. Sadly not."
The Good Morning Britain presenter also accused Meghan and Harry of being hypocrites for posting the images on Instagram, just weeks after the Duke of Sussex spoke about the damaging effects of social media on mental health.
Morgan even went on to suggest that Meghan had got her friends in the US to say say positive things about her, adding: "The friends... lined up to say how fabulous Meghan is... how she is categorically ‘NOT A DIVA!'
"(Pro tip: whenever people repeatedly have to get their friends to deny they’re a diva, you know they’re a diva.)"