Prince William MOCKS Prince Harry over #RoyalBabyBoy's birth #MeghanMarkle

The Duke and Duchess of Cambridge arrived in Cutty Sark, east London, for a lunchtime engagement where they will launch a new sailing competition taking place on August 9 to raise money for eight of their charities. William and Kate are set to go head to head in person in the King's Cup Regatta this summer, staged in the waters off the Isle of Wight, to raise awareness and funds for eight of their patronages. 

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At today's launch, William and Kate, who donned a white-and-blue shirt paired with trousers, were greeted by Sir Keith Mills and the Commodore of the Royal Squadron, Jamie Sheldon. 

The couple took the chance to speak about Meghan and Prince Harry's first son, who was born yesterday at 5.26am. 

The Duke of Cambridge said he is "absolutely thrilled" about the news, and jokingly mocked his brother Harry saying he welcomes him "to the sleep deprivation society that is parenting".   

READ MORE: Royal Baby LIVE: Queen and Philip at rare Windsor Castle event as they see Meghan & Harry

kate middleton news prince william meghan markle royal baby prince harry instagramKate and Prince William stepped out in London today (Image: REUTERS)

kate middleton news prince william meghan markle royal baby prince harry instagramThe message shared by kensingtonroyal yesterday (Image: INSTAGRAM/KENSINGTONROYAL)

The Cambridges welcomed the birth of Baby Sussex yesterday afternoon with a message shared on their Instagram account, kensingtonroyal.

The couple said they were “delighted” with the news of his arrival and looked forward to meeting the baby boy.

The message read:

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