Congratulations have flooded in from Americans and the rest of the world following the arrival of the Royal baby.
The arrival of the Duke and Duchesses baby son has been marked across the world in different ways, such as the Niagara Falls being illuminated blue and trees planted in New Zealand.
Those in the US have been particularly excited following the announcement as Meghan Markle is the first American to become a part of the Royal Family.
Former US first lady Michelle Obama was among those sending their congratulations from across the pond.
She tweeted: "Barack and I are so thrilled for both of you and can't wait to meet him".
Meghan's former Suits co-stars have also sent their well-wishes.
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Patrick J Adams said: "Just heard that the world just got heavier by 7 pounds and 3 ounces. Much love to him and his incredible parents."
Sarah Rafferty, who also starred alongside Meghan in the US show, tweeted: "Hearts are leaping for a beautiful, wondrous and healthy baby boy! Sending much love and wishes for every blessing across the pond today and everyday!"
Actress and friend of the duchess Priyanka Chopra regrammed Meghan and Harry's Instragram announcement, commenting: "Congratulations, M & H" alongside a pink heart.
Canadian prime minister Justin Trudeau said the country "joins the world in celebrating a new addition to the @RoyalFamily!
"Congratulations, Prince Harry & Meghan! Enjoy every minute of this happy time together as a new family of three," he tweeted.
In Canada, Niagara Falls was bathed in blue light to mark the baby boy's arrival, while in Toronto the CN Tower was illuminated in purple.
New Zealand Prime Minister Jacinda Ardern congratulated Harry and Meghan and revealed the country's gifts for the royal baby.
She told TVNZ: "A donation will be made to a group called Little Sprouts, who prepare baby boxes for families in need on the birth of their babies. And also, we'll be purchasing 10 trees through the Trees That Count programme, native trees to acknowledge the birth of their baby.
Australian Prime Minister Scott Morrison also sent his "huge congratulations" to the couple, tweeting: "Becoming a parent is one of the greatest joys of life!"
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Bishop Michael Curry, who gave the rousing sermon about love at Harry and Meghan's wedding, tweeted: "The Jewish tradition reminds us that the birth of every child is a reminder that God is not finished with us yet.
"There is hope. Congratulations to the Duke and Duchess of Sussex and prayers of blessing for them and their baby."
Former One Direction star Liam Payne also sent his congratulations, tweeting: "So happy for the both of you."
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