Baby Sussex's birth announcement included a sweet tribute to Princess Diana

Baby Sussex is finally here!

The Duke and Duchess of Sussex took to Instagram to announce the birth of their first child, a son, on Monday, May 6 at 5:26 am GMT, weighing 7 pounds, 3 ounces.

A separate statement from the royal family revealed that several key family members, including the Queen, Prince Charles and Prince William and Duchess Catherine were all “delighted” by news of the young royal’s arrival.

While the duchess’s mother Doria Ragland is staying with the couple at their Frogmore Cottage home, the announcement also included a sweet tribute to Prince Harry’s late mother.

The royal family confirmed that Princess Diana’s siblings, sisters Lady Jane Fellowes, Lady Sarah McCorquodale and Earl Spencer were informed before announcing the birth to the general public.

22 PHOTOS
Princess Diana with her sons
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Princess Diana with her sons
VENICE, ITALY - MAY 5: (FILE PHOTO) (L-R) Diana the Princess of Wales holds her son Harry, whilst looking at Prince William held by his father Prince Charles on May 5, 1985 in Venice, Italy. Prince William will celebrate his 21st birthday on June 21, 2003. (Photo by Georges de Keerle/Getty Images)
Princes William and Harry with their mother, Diana, Princess of Wales (1961 - 1997) in the garden of Highgrove House in Gloucestershire, 18th July 1986. William is wearing a Dallas Cowboys t-shirt.(Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana At Highgrove With Prince William And Prince Harry Dressed In Miniature Parachute Regiment Uniforms And Playing On Their Slide In The Garden (Photo by Tim Graham/Getty Images)
TETBURY, UNITED KINGDOM - JULY 18: Princess Diana With Her Sons Prince William And Prince Harry Playing With A Playhouse In The Garden Of Their Home Highgrove (Photo by Tim Graham/Getty Images)
The Prince and Princess of Wales on holiday with their children, Princes William and Harry, at the Spanish royal residence Marivent Palace, August 1987. (Photo by Terry Fincher/Getty Images)
The Princess of Wales arriving at Aberdeen airport with her sons William and Harry for a holiday at Balmoral Castle, August 1986. Princess Diana is wearing a polo motive sweater by Mondi. (Photo by Jayne Fincher/Getty Images)
UNITED KINGDOM - DECEMBER 01: Prince Charles, Prince of Wales and Diana, Princess of Wales at home in Kensington Palace with their sons Prince William and Prince Harry (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 16: Princess Diana And Prince William Leaving After Delivering Prince Harry To Mrs. Mynor's Nursery School. (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - JUNE 11: Diana, Princess Of Wales, Holding A Young Prince Harry In Her Arms As She Watches Trooping The Colour With Prince William And Princess Margaret From The Balcony Of Buckingham Palace. (Photo by Tim Graham/Getty Images)
BALMORAL, SCOTLAND - AUGUST 18: Diana, Princess of Wales, and Prince Harry play on the banks of the River Dee, near Balmoral Castle.during a Summer vacation, on August 18, 1987, in Balmoral, Scotland. (Photo by Julian Parker/UK Press via Getty Images)
NECKER ISLAND, BRITISH VIRGIN ISLANDS - JANUARY 9: Diana, Princess of Wales, with Prince Harry ( centre ), and her Niece's and Nephew's on holiday on Necker Island , on January 9, 1989 in Necker Island, British Virgin Islands. (Photo by Julian Parker/UK Press via Getty Images)
BATH - MAY 30: (FILE PHOTO) Prince William, Diana, Princess of Wales, Prince Harry and Charles, Prince of Wales, attend the wedding of the Duke of Hussey's daughter in May, 1989 in Bath, England. (Photo by Anwar Hussein/Getty Images)
LONDON - SEPTEMBER 12: (FILE PHOTO) Princess Diana with her sons Prince William and Prince Harry at Wetherby School on September 12, 1989 in London, England. It is Prince Harry's first day at school. (Photo by Anwar Hussein/Getty Images)
Diana, The Princess Of Wales Takes Her Sons, Prince'S William, And Harry Out On The Boat ' Maid Of The Mist ' To View Niagara Falls. (Photo by Julian Parker/UK Press via Getty Images)
CHERTSEY, UNITED KINGDOM - APRIL 18: Diana, Princess of Wales, with Prince Harry, on the Depth Charge ride at Thorpe Park, Theme Park, on April 18, 1992 in Chertsey United Kingdom . (Photo by Julian Parker/UK Press via Getty Images)
LECH, AUSTRIA - APRIL 10: Princess Diana With Princes William & Harry Skiing In Lech, Austria (Photo by Tim Graham/Getty Images)
Diana Princess Of Wales, Prince William & Prince Harry Visit The 'Thorpe Park' Amusement Park. (Photo by Julian Parker/UK Press via Getty Images)
AUSTRIA - MARCH 30: Lech: Princess Diana, sons William and Harry going to restaurant in calash In Lech, Austria On March 30, 1993. (Photo by Laurent SOLA/Gamma-Rapho via Getty Images)
LECH, AUSTRIA - MARCH 27: Princess Diana With Prince William & Prince Harry In Sleigh During Ski Holiday In Lech, Austria. Behind Are Diana's Friends Kate Menzies And Catherine Soames (Photo by Tim Graham/Getty Images)
LONDON, UNITED KINGDOM - AUGUST 19: Princess Diana, Prince Harry [ Waving ] And Prince William Watching The Parade Of Veterans On V J Day, The Mall, London. Designer Of Diana's Suit - Tomasz Starzewski (please Check - People Magazine, 04/12/1999) (Photo by Tim Graham/Getty Images)
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess holding Prince William whilst pregnant with Prince Harry, and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
EMBARGOED TO 0001 Sunday July 23, 2017. NO USE AFTER MONDAY JULY 31, 2017. NEWS EDITORIAL USE ONLY. NO USE ON THE FRONT COVERS OF ANY UK OR INTERNATIONAL MAGAZINES. NO COMMERCIAL USE (including any use in merchandising, advertising or any other non-editorial use including, for example, calendars, books and supplements). This photograph (whose copyright is vested in the Duke of Cambridge and Prince Harry) is provided to you on condition that you will make no charge for the supply, release or publication of it and that these conditions and restrictions will apply (and that you will pass these on) to any organisation to whom you supply it. All other requests for use should be directed to the Press Office at Kensington Palace in writing. This photograph released by Kensington Palace, from the personal photo album of the late Diana, Princess of Wales, shows the princess and Prince Harry on holiday and features in the new ITV documentary 'Diana, Our Mother: Her Life and Legacy', which airs on ITV at 21.00hrs on Monday 24th July.
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Harry has stayed close to his mother’s siblings, and even asked his aunt, Lady Jane Fellowes, to give a reading at the their May 2018 royal wedding.

After announcing their engagement in 2017, Markle noted in a televised interview just how important it was for her to get to know Princess Diana’s siblings as well as her good friend, Julia Samuels.

“I think in being able to meet his aunts and also like Julia and just different people who were so important to his mum, I’m able to, in some way, know a part of her through them and of course through him,” Markle said. “It’s incredibly special.”

See how Britain is celebrating the newest royal baby:

23 PHOTOS
Windsor celebrates arrival of Baby Sussex
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Windsor celebrates arrival of Baby Sussex
Royal super fan Anne Daley poses with baby-themed balloons as she waits near Windsor Castle, west of London on May 6, 2019, for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by ADRIAN DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
A Royal baby-themed babygrow is pictured in the window of a souvenir shop near Windsor Castle in Windsor, west of London on May 6, 2019, as Royal fans wait for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by ADRIAN DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Royal super fans John Loughery (L) and Anne Daley stand near Windsor Castle, west of London on May 6, 2019, with baby-themed items as they wait for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by ADRIAN DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Royal super fans John Loughery (L) and Anne Daley pose with Union flags and baby-themed balloons as they wait near Windsor Castle, west of London on on May 6, 2019, for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Royal super fans John Loughery (L) and Anne Daley pose with Union flags and baby-themed balloons as they wait near Windsor Castle, west of London on on May 6, 2019, for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Royal fan Terry Hutt celebrates his 84th birthday outside Windsor Castle in Berkshire as the country waits for the birth of The Duke and Duchess of Sussex's first child. (Photo by Steve Parsons/PA Images via Getty Images)
Royal super fan Anne Daley poses with baby-themed balloons as she waits near Windsor Castle, west of London on on May 6, 2019, for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by ADRIAN DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
A Royal Baby outfit is pictured on display in a shop window as excitement builds in the town waiting for the birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex, on May 3, 2019. (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Royal baby items in the Glorious Britain shop window near Windsor Castle in Berkshire as the country waits for the birth of The Duke and Duchess of Sussex's first child.
Royal super fans John Loughery (C) pops the cork on a bottle of champagne, as they stand near Windsor Castle in Windsor, west of London on May 6, 2019, following the announcement that Britain's Meghan, Duchess of Sussex has given birth to a son. - Meghan Markle, the Duchess of Sussex, gave birth on Monday to a "very healthy" boy, Prince Harry announced. "We're delighted to announce that Meghan and myself had a baby boy early this morning -- a very healthy boy," a beaming Prince Harry said. (Photo by ADRIAN DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Royal super fans John Loughery (C) pops the cork on a bottle of champagne, as they stand near Windsor Castle in Windsor, west of London on May 6, 2019, following the announcement that Britain's Meghan, Duchess of Sussex has given birth to a son. - Meghan Markle, the Duchess of Sussex, gave birth on Monday to a "very healthy" boy, Prince Harry announced. "We're delighted to announce that Meghan and myself had a baby boy early this morning -- a very healthy boy," a beaming Prince Harry said. (Photo by ADRIAN DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Visitors walk outide the Long Walk entrance to Windsor Castle in Windsor, west of London on May 6, 2019, after the announcement that Britain's Meghan, Duchess of Sussex has given birth to a son. - Meghan Markle, the Duchess of Sussex, gave birth to a son early on Monday with her husband Prince Harry by her side, Buckingham Palace announced. "The Duchess went into labour in the early hours of this morning," it said in a statement. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Windsor Castle (R) is reflected in the window of a souvenir shop selling Royal-themed items in Windsor, west of London on May 6, 2019, as Royal fans wait for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by ADRIAN DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Royal super fan John Loughery wears a Harry and Meghan-themed item as he waits near Windsor Castle, west of London on on May 6, 2019, for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex. (Photo by Adrian DENNIS / AFP) (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Royal super fan John Loughery poses as he sits in Windsor waiting for news of the imminent birth of the child of Britain's Prince Harry and Meghan, Duke and Duchess of Sussex on May 3, 2019. (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Well wishers gather outside Windsor Castle in Windsor, south England, Monday May 6, 2019, after Prince Harry announced that his wife Meghan, Duchess of Sussex, has given birth to a boy. (AP Photo/Alastair Grant)
People gather outside Buckingham Palace in London, Monday May 6, 2019, after Prince Harry announced his wife Meghan, Duchess of Sussex had given birth to a baby boy. (Yui Mok/PA via AP)
Royal fans celebrate outside Windsor Castle in Berkshire after Buckingham Palace announced the news of the birth of a baby boy born to Prince Harry and Meghan Duchess of Sussex, Monday May 6, 2019. It is the first child for Harry and Meghan, who married a year ago. (Dominic Lipinski/PA via AP)
Television crews at work outside Windsor Castle following the news of the birth of the Duke and Duchess of Sussex's new baby boy. (Photo by Dominic Lipinski/PA Images via Getty Images)
Royal fans celebrate outside Windsor Castle in Berkshire after Buckingham Palace has announced the news of the birth of the Duke and Duchess of Sussex's new baby boy. (Photo by Dominic Lipinski/PA Images via Getty Images)
Television crews at work outside Windsor Castle following the news of the birth of the Duke and Duchess of Sussex's new baby boy. (Photo by Dominic Lipinski/PA Images via Getty Images)
Royal fans outside Windsor Castle in Berkshire after Buckingham Palace has announced the news of the birth of the Duke and Duchess of Sussex's new baby boy. (Photo by Dominic Lipinski/PA Images via Getty Images)
Royal fans Terry Hutt and Margaret Tyler celebrate Terry's 84th birthday outside Windsor Castle in Berkshire as the country waits for the birth of The Duke and Duchess of Sussex's first child. (Photo by Steve Parsons/PA Images via Getty Images)
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