Prince Harry is reportedly feeling pangs of “regret” over his decision to leave royal duties amid Prince William and Princess Catherine’s starring roles in the French state visit to the United Kingdom.

The Prince and Princess of Wales were the main attractions during the first day of an official state visit by French President Emmanuel Macron and First Lady Brigitte Macron.

The Wales’ met the French president and his wife on the tarmac on Tuesday, with Catherine wowing fashion critics in an elegant dusty pink Dior suit.

The French luxury house has recently installed Northern Irish designer Jonathan Anderson as creative director, making Kate’s choice of outfit a savvy diplomatic move.

Photos of Catherine at Tuesday evening’s state banquet in a show-stopping Givenchy gown and dazzling tiara were beamed across the globe, with the palace reportedly thrilled by the public’s enthusiasm over Kate’s return to royal duties.

According to royal insider Richard Fitzwilliams, the Duke of Sussex feels “exiled”and increasingly role-less amid his ongoing estrangement from the monarchy.

“(Harry) is in exile,” Mr Fitzwilliams told Fox News Digital on Wednesday after Kate and William’s diplomatic triumph.

“Undoubtedly, he has some regrets.

“He appears to have lost touch with many of his friends and, of course, there is the royal rift.”

It is understood Harry remains estranged from both William and his father King Charles after cashing in on royal secrets in interviews, a Netflix show and his memoir Spare.

While the Prince and Princess of Wales’ latest appearance offered a glamorous glimpse into their future reign, Harry and his wife Meghan Markle have largely fallen out of the headlines.

The Duchess of Sussex was pencilled in to receive a humanitarian award at a glitzy Los Angeles gala last month, but the event was canned amid violent protests in the city.

It is understood the Sussexes have also recently downsized their mammoth PR team and reportedly let go of six employees last month.