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Kate and William put on united front in matching outfits for first outing since Harry's book release

Watch: William and Kate wave to crowds as they arrive in Liverpool

Prince William and Kate, Princess of Wales have made their first public outing since the release of Prince Harry’s memoir earlier this week, which made several accusations against the couple.

The Prince and Princess of Wales were seen wearing matching navy and green outfits as they arrived in Liverpool to open a new hospital on Thursday.

Read more: Prince Harry details argument with Meghan in book: 'I spoke to her harshly, cruelly'

King Charles III has also made his first appearance since Harry’s memoir was released, speaking to charity workers in Scotland at the Aboyne and Mid Deeside Community Shed in Aberdeenshire.

Kate Middleton and Prince William wave to crowds. (Getty Images)
Kate Middleton and Prince William have made their first public appearance since the release of Harry's memoir. (Getty Images)

Whether intentional of not, William and Kate visually reminded the world they're united in matching outfits, with William wearing navy trousers and a blazer over a forest green-hued jumper.

Kate matched her husband with her Cefinn Eva Blouson sleeve merino knit dress in black (£290), a the Mulberry’s Amberley Satchel in green (£850), Gianvito Rossi's Gianvito 105 suede pumps in navy (£530), and her green and navy checkered Holland Cooper double breasted coat in “Blackwatch” (£749), which the royal has worn on several occasions.

Kate Middleton and Prince William wave to crowds. (Getty Images)
Prince William and Kate Middleton put on a united front in matching outfits on Thursday. (Getty Images)

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Harry’s autobiography, Spare, sold more than 1.4 million copies on the day of its release, which its publisher Penguin Random House claims makes it the fastest-selling non-fiction book in history.

In the book, Harry claimed that his brother William once “physically attacked” him by grabbing his collar, ripping off his necklace and knocking him to the floor.

Read more: Prince Harry's dating history as he reveals mystery 'older woman' took his virginity

Harry said the altercation escalated after William called Harry’s wife Meghan Markle “difficult”, “rude”, and “abrasive”.

Harry also commented on the reported rift between Meghan and Kate in his book, recounting how, when Kate was pregnant with Prince Louis in 2018, she said she was owed an apology by Meghan who had told Kate she had “baby brain” due to “pregnancy hormones”.

King Charles III visits Aboyne and Mid Deeside Community Shed in Aboyne in Scotland while wearing a kilt. (Getty Images)
King Charles III wore a kilt for his appearance in Scotland on Thursday. (Getty Images)

While no member of the royal family has commented on the book’s release or its contents, a source told US Weekly that William is “absolutely horrified” by claims made by Harry and that he “doesn’t even recognise his brother anymore”.

Read more: From Prince Harry's book to King Charles' coronation, this year's big royal events

A new YouGov poll found that Harry’s popularity had dipped in the lead up to Spare’s release, with just 26% of the 1,691 surveyed having positive views of the royal, while 64% have a negative view of the King’s youngest son.

In a separate ongoing YouGov poll that ranks the popularity of the British Royal Family, Harry sits at ninth, while Kate and William place second and third respectively.