Princess Eugenie has congratulated her "dear cousins" Harry and Meghan after the birth of their new baby in adorable fashion - on Instagram.
The couple announced on Sunday Meghan had given birth to Lilibet "Lili" Diana Mountbatten-Windsor, their second child together after Archie two years ago.
Taking to Instagram, the Queen's granddaughter, 31, posted the famous black and white image of Harry and Meghan the couple used to announced they were expecting their second baby.
Under the photograph, Eugenie - who gave birth just four months ago to August - wrote: "Congratulations dear cousins.. we couldn't be happier for you all."
Her caption was accompanied by heart emojis.
The post is notable for its casual and informal style, which makes for a striking comparison with the more traditional approach to congratulations offered by the rest of the royal family.
Earlier on Sunday, Buckingham Palace spokesperson said: “The Queen, The Prince of Wales and The Duchess of Cornwall, and The Duke and Duchess of Cambridge have been informed and are delighted with the news of the birth of a daughter for The Duke and Duchess of Sussex.”
The baby girl has been named Lilibet after the Queen's family nickname but she will be known as Lili.
The new arrival is a new cousin for Prince George, Princess Charlotte and Prince Louis.
A statement from the couple's press secretary said: "It is with great joy that Prince Harry and Meghan, The Duke and Duchess of Sussex, welcome their daughter, Lilibet "Lili" Diana Mountbatten-Windsor, to the world.
"Lili was born on Friday, June 4 at 11.40am in the trusted care of the doctors and staff at Santa Barbara Cottage Hospital in Santa Barbara, California.
"Her middle name, Diana, was chosen to honour her beloved late grandmother, The Princess of Wales."
The royal couple has now decided to spread the love, by urging fans across the globe to donate to poignant charities rather than sending them gifts.
A post on the couple's Archewell Foundation website said: "For those inquiring on sending gifts, we would ask that you support or learn more about these organizations working for women and girls: Girls Inc, Harvest Home, CAMFED or Myna Mahila Foundation.
"While the Duke and Duchess are on parental leave, Archewell will continue to do important work and publish stories on the site. We look forward to seeing you!"
The family have been living in the US since they quit the royal family last year.
