Rumours are heating up Kate Middleton is pregnant with her fourth child

After months of pregnancy rumours surrounding Kate Middleton, royal fans have been sent into absolute meltdown over the chance the mother-of-three will announce she is expecting her fourth child after bookies slashed all odds than an announcement was imminent.

Yes, apparently the Duchess of Cambridge - who is already mum to Prince George, six, Princess Charlotte, four, and Prince Louis, one - will have another royal baby on the way by the end of the year.

According to British-based betting company Coral,  it's looking increasingly likely Wills and Kate "will welcome another family member," with the odds being slashed to 1/2 the 37-year-old will announce another royal baby is set to join the brood in 2019.

Coral spokesman Harry Aitkenhead said: "Much has been made of Prince Harry’s comments that he and Meghan will most likely only have two children.

"However, we think Kate and Will’s family will continue to grow and make them odds on to announce a fourth baby in 2019."

While Ladbrokes believes both Meghan Markle and Kate Middleton will give birth next year, with the odds at 3/1.

Alex Apati of Ladbrokes said: "We’re anticipating a huge year for the royals in 2020 with not one but two new additions seemingly on their way."

The speculation comes after it was reported the Duchess is said to be "broodier than ever" following the arrival of Prince Harry and Meghan Markle's first child, Archie.

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Many royal watchers believe four kids is certainly a possibility for the Duke and Duchess since it's the same number of children his grandmother, Queen Elizabeth II, had.

"Prince William reportedly wants to follow Queen Elizabeth II’s footsteps by having four children," one of William’s friends revealed.

While a friend of Kate's agreed, telling the Daily Mail: "Catherine would like another baby. She loves children and is prepared to put herself through another pregnancy even though they have been complicated in the past."

However, after the 37-year-old mum experienced Hyperemesis Gravidarum, which causes extreme morning sickness during her pregnancies she might be happy to stop at three.