Following the lovely news of the Duke and Duchess of Sussex's new arrival on Monday morning, Prince Harry's brother and sister-in-law, the Duke and Duchess of Cambridge, have expressed their excitement at the new addition to the extended family. In an interview with the press, while they attended the King’s Cup Regatta at Cutty Sark, in London, Prince William said they were "absolutely thrilled" at the new arrival, but joked he would welcome them to the "Sleep Deprivation Society".
The dad-of-three went on to say he was, "Looking forward to seeing them in the next few days, when things have quietened down". The Duke was then asked if he had any new parent advice for his brother, to which he replied, "There’s plenty of advice, but I wish him all the best and hope over the next few days they will settle down and enjoy having a newborn in the family and all the joys that come with that."
Prince Harry and Meghan Markle, officially known as the Duke and Duchess of Sussex since their wedding last year, welcomed their first child on Monday 6th May, with the news being announced across their social accounts, revealing the couple had a little boy, weighing 7lbs, 3oz. The caption read, 'We are pleased to announce that Their Royal Highnesses The Duke and Duchess of Sussex welcomed their firstborn child in the early morning on May 6th, 2019. Their Royal Highnesses’ son weighs 7lbs. 3oz.
'The Duchess and baby are both healthy and well, and the couple thank members of the public for their shared excitement and support during this very special time in their lives.'
The Duke and Duchess of Sussex married in May 2018, and first announced they were expecting a baby in October last year. Since the news of the birth, many celebrities have sent their well wishes to the happy couple on social media, including the likes of Vicky Pattison, Patrick J. Adams and the Prime Minister.
WATCH: Prince Harry tells Meghan she looks amazing during their wedding
Now take a look at Meghan Markle and Prince Harry's relationship timeline:
Meghan Markle and Prince Harry's relationship timeline

Prince Harry and Meghan Markle
Prince Harry and Meghan Markle met in London in July 2016.

Prince Harry and Meghan Markle
They were introduced by mutual friend Markus Anderson, who is the director of Soho House.

Prince Harry and Meghan Markle
In October 2016, the Express became the first newspaper to publish news that Prince Harry had a new girlfriend.

Prince Harry and Meghan Markle
On November 8th 2016, Kensington Palace released an unprecedented statement which referring to Markle as Harry's girlfriend for the first time.

Prince Harry and Meghan Markle
In the statement, Prince Harry condemned the 'wave of abuse and harrassment' faced by Markle, saying that he was 'worried about Ms. Markle's safety and is deeply disappointed that he has not been able to protect her.'

Prince Harry and Meghan Marklec
'It is not right that a few months into a relationship with him that Ms. Markle should be subjected to such a storm,' the statement continued.

Prince Harry and Meghan Markle
The couple were papped together for the first time in December 2016, shopping for a Christmas tree in London at the Pines and Needles store.

Prince Harry and Meghan Markle
Later that week, they were seen on London's West End, catching a performance of The Curious Incident of the Dog in the Night-Time.

Prince Harry and Meghan Markle
In February, Prince Harry wore a his 'n' hers bracelet on the cover of Town & Country magazine, just weeks after Markle was pictured wearing the same one on Instagram.

Prince Harry and Meghan Markle
In March 2017, Meghan joined Prince Harry in the Caribbean for the wedding of his friend's Tom 'Skippy' Inskip and Lara Hughes-Young.

Prince Harry and Meghan Markle
It was the first time that Markle accompanied Harry to a wedding, marking another milestone occasion for the couple.

Prince Harry and Meghan Markle
The first public event attended by the couple was the polo at Coworth Park in May 2017.

Prince Harry and Meghan Markle
Later in May, Markle attended the party portion of Pippa Middleton's wedding to James Middelton.

Prince Harry and Meghan Markle
Prince Harry was seen driving her to the event after the church ceremony.

Prince Harry and Meghan Markle
The couple were photographed together the following day at the wheelchair tennis.

Prince Harry and Meghan Markle
The couple 'broke with royal protocol' by holding hands and appearing affectionate while at the Invictus Games.

Prince Harry and Meghan Markle
In an interview with Vanity Fair, Meghan referred to Harry as her boyfriend numerous times, saying: 'We're a couple. We're in love. I'm sure there will be a time when we will have to come forward and present ourselves and have stories to tell, but I hope what people understand is that this is our time.'

Prince Harry and Meghan Markle
In early November 2017, it was reported that Meghan Markle was leaving Suits after seven series.

Prince Harry and Meghan Markle
Much was made of Markle's choice of outfit: ripped jeans and a white blouse called 'The Husband'.

Prince Harry and Meghan Markle
Although Prince Harry was sat next to First Lady Melania Trump at the event, rather than his girlfriend, she was only seated a few rows behind him.

Prince Harry and Meghan Markle
The couple made their first official public appearance in September, when Markle attended the opening of Prince Harry's Invictus Games.

Prince Harry and Meghan Markle
In mid-November 2017, bookies suspending betting on an impending royal engagement, as speculation grew that an announcement was about to be made.

Prince Harry and Meghan Markle
On November 27th 2017, Prince Charles announced the engagement of his younger son Prince Harry and Meghan Markle after 15 months of dating.

Prince Harry and Meghan Markle
The couple later appeared at a photocall, with Markle wearing a white dress coat by Canadian brand Line The Label. The website has subsequently crashed.

Prince Harry and Meghan Markle
The engagement ring, by Cleave and Company, was reportedly designed by Prince Harry himself, using two stones that belonged to Princess Diana.

Prince Harry and Meghan Markle
When asked by waiting photographers if the proposal was romantic, Harry joked 'of course!'

Prince Harry and Meghan Markle
The couple indulged in some PDA at the closing ceremony.

Prince Harry and Meghan Markle
Meghan wore a maroon midi dress with a pleated chiffon skirt by one of her favourite Canadian brands Aritzia.

Prince Harry and Meghan Markle
She teamed it with a matching burgundy biker jacket by Mackage.

Prince Harry and Meghan Markle
Prince Harry reportedly spent time with Meghan's mother Doria while at the Games too.

Prince Harry and Meghan Markle
Prince Harry was photographed kissing Meghan.

Prince Harry and Meghan Markle
In late September 2017, it was reported that Meghan had met the Queen, prompting speculation that the relationship was getting serious.
The name for the couple's new arrival has yet to be announced, along with the first photos of the new royal baby.
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