A message was shared on the Duke and Duchess of Cambridge’s official Twitter account.
They posted a smiling picture of the Duke of Sussex and said: “Happy Birthday Prince Harry!”
William and Kate’s birthday message to Harry comes as the brothers have been embroiled in an ongoing rift.
The Duke of Sussex clelebrates his 37th birthday today as he continues his new life across the pond with Meghan Markle.
The couple quit royal duties last year and have moved to California.
They hit out at the Royal Family in their controversial Oprah Winfrey interview in March.
Harry laid bare his rift with William, admitting the relationship was “space” and adding: “Time heals all things, hopefully.”
It is not known if the Duke of Sussex will publicly mark his birthday.
The Duchess launched a mentoring project for women on her 40th birthday in August.
Harry is likely to celebrate in private with Meghan and their two children Archie and Lili.
The Duchess will no doubt make sure her husband has a special day.
The former actress previously opened up on birthdays on her now-closed blog The Tig.
Writing in 2016, she said: “My mom has always said that birthdays are your own personal New Year.
“Your own chance to make resolutions just for yourself and what you prognosticate for your year ahead.”
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