The Duke and Duchess of Cambridge shared a black and white photograph of the couple, with their son, Archie, on Instagram, on Sunday evening.
They captioned the post: “We are all delighted by the happy news of the arrival of baby Lili.
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“Congratulations to Harry, Meghan and Archie.”
It’s been highly publicised that the two couples aren’t on great terms right now, so fans have praised William and Kate for being a ‘class act’.
One person wrote: “Taking the high road once again. This is why you are the future of England.”
“So very gracious of you after everything – first class as always,” added another.
A third penned: “This is what the class and dignity of nobility looks like. Kindness and politeness in any situation.”
Harry and Meghan confirmed they had welcomed their baby girl, who they have named Lili, in a statement over the weekend.
It read: “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 11:40 a.m. in the trusted care of the doctors and staff at Santa Barbara Cottage Hospital in Santa Barbara, CA.
“She weighed 7 lbs 11 oz. Both mother and child are healthy and well, and settling in at home.
“Lili is named after her great-grandmother, Her Majesty The Queen, whose family nickname is Lilibet. Her middle name, Diana, was chosen to honor her beloved late grandmother, The Princess of Wales.
“This is the second child for the couple, who also have a two-year-old son named Archie Harrison Mountbatten-Windsor.
“The Duke and Duchess thank you for your warm wishes and prayers as they enjoy this special time as a family.”
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