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It's A Boy! Duchess Kate Delivers Royal Baby No. 3

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LONDON (CBSMiami) -- The Duke and Duchess of Cambridge proudly introduced their new little prince to the world just hours after the birth.

The Duke & Duchess Of Cambridge Depart The Lindo Wing With Their New Son
LONDON, ENGLAND - APRIL 23: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, depart the Lindo Wing with their newborn son at St Mary's Hospital on April 23, 2018 in London, England. The Duchess safely delivered a boy at 11:01 am, weighing 8lbs 7oz, who will be fifth in line to the throne. (Photo by Gareth Cattermole/Gareth Cattermole/Getty Images)

The 8 pound, 7 ounce baby will be a little brother to 4 year old Prince George and 2 year old Princess Charlotte.

After several hours of labor, Duchess Kate gave birth at the prestigious Lindo wing of St. Mary's Hospital in London.

Fans broke out champagne to toast the arrival of the baby boy.

An unofficial town crier announced the news, but the official royal bulletin was posted on a golden easel outside Buckingham Palace, an age-old custom for the public to see.

PHOTO GALLERY: ROYAL COUPLE MAKES FIRST APPEARANCE WITH NEW BABY BOY 

"I think it will add a little bit more family, a bit more joy into them, we are looking forward to seeing what the name will be," said Isabel Mitchell, a tourist from Australia.

BRITAIN-ROYALS-BABY
Britain's Prince William, Duke of Cambridge carries his newly-born son from the Lindo Wing at St Mary's Hospital in central London, on April 23, 2018. (Photo by Ben STANSALL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)

It can take days or even weeks for royal parents to announce a name.  William and Kate will need to run it by Queen Elizabeth first but top bets are on Arthur, Albert and Philip.

Adding to the excitement, the royal baby was born on St. George's Day, which celebrates the patron Saint of England.

"It's brilliant for the country. It's going to lift everyone's spirits," said royal fan Maria Scott.

The tiny prince will be fifth in line to the British throne, after grandfather Prince Charles, father William, Prince George and sister Princess Charlotte. Uncle Prince Harry gets bumped down to sixth.

This is the sixth great-grandchild for Queen Elizabeth her turned 92 on Saturday.

The British royal family is set for a big year, with Prince William's brother Prince Harry set to marry American actress Meghan Markle on May 19 at Windsor Castle, outside London.

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