As with their older two children's names, William and Kate will reveal their chosen name to the Queen before announcing it publically.
Britain's newest little prince was welcomed to the world Tuesday with ringing bells and multiple gun salutes as his Auntie Pippa rushed to Kensington Palace to check out her still unnamed baby nephew.
The changes in the rules of succession make Princess Charlotte the first royal girl to welcome a baby brother and not lose her line in succession.
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Kate Middleton's younger sister was seen leaving Kensington Palace in London, England, just a day after the Duchess of Cambridge gave birth to her third child. When it came to finding out William's moniker, meanwhile, Charles and Diana, Princess of Wales waited until seven days after his birth in 1982. Prince Harry and Meghan Markle also attended the service. He is also Queen Elizabeth II's sixth great-grandchild.
Like his siblings, Prince William and Kate Middleton's new baby boy, the newest addition to the the British Royal Family, has boosted economic opportunities for retailers and thrilled loyal fans hoping to by related memorabilia.
Kensington Palace said it would be announced in "due course".
Proud parents the Duke and Duchess of Cambridge - or Will and Kate - stepped out holding their new tiny baby, just hours after she had given birth to the healthy baby boy.
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