BREAKING NEWS: Is this PROOF that Kate and Wills are going to have their 4th child?

Prince Harry and Meghan Markle are preparing to welcome their first child together in 2019, as we all know, but suddenly the bookies are offering odds on Prince William and Princess Kate making an unexpected announcement too. 

Betting site Ladbrokes have odds of just 7/2 for Prince William and Kate Middleton revealing they are expecting their fourth child by the end of the year. 

Already?!

Alex Apati, spokesman for Ladbrokes, said: "Baby mania is in full swing in the Royal Family right now so it's no surprise to see odds on a fourth Wills and Kate baby so short."

The Cambridge parents already share three children - Prince George, 5, Princess Charlotte, 3, and Prince Louis, 6 months. 

Earlier in the year, Kate’s former school friend Jessica Hay revealed how the princess would love a fourth and final baby sooner rather than later.

"They’re a family of five now, so I would expect them to have one more baby to make a nice round number of six before long," Jess said. 

"In fact, William’s telling everyone that they would love to have one more baby in the next 18 months!"

Kate gave birth to Louis earlier this year and although he hasn't been spotted out and about too much, we saw him just this week in newly-released photos of the Royal Family to celebrate Prince Charles 70th birthday. 

If Kate is pregnant, the new baby will be just weeks apart from its royal cousin - the son or daughter of Prince Harry and Meghan Markle, due in 2019.