Londoners were able to watch as sights such as the Tower Bridge, the London Eye, Trafalgar Square's fountains and Blackburn Tower lit up with a shade of pink. The BT Tower was one of the first to mark the occasion with the words "it's a girl" showing across the top.
Tower Bridge turns pink for new baby princess pic.twitter.com/Nolf9inTgR— Simon (@SimonsofLondon) May 3, 2015
Kate gave birth to a baby girl weighing 8 lbs 3 oz in a private wing of St Mary's Hospital in west London at about 08:34am yesterday morning. It was the same hospital where Prince George was born just under two years ago.
"Her Royal Highness and her child are both doing well," the palace said in a statement following the birth.
The couple are yet to announce a name for the newborn, but bookies are touting either Alice or Charlotte.
More on this: Here's how Prince George's birth affected the economy