According to the royal expert, betting company Ladbrokes have dropped their odds to 1/5 in response to the speculation.
Presently the Duke and Duchess of Cambridge are parents to Prince George, Princess Charlotte and Prince Louis.
Interestingly, Angela pointed out that if William and Kate have a fourth child, they will be mirroring Queen Elizabeth II and Prince Philip (who are parents to Prince Charles, Princess Anne, Prince Andrew and Prince Edward).
"So we could be seeing that fourth baby which would be like the Queen," said Mollard.
"If you think about it, she had boy-girl-boy-boy. So far Kate’s had boy-girl-boy. Another boy and she will be replicating the Queen."
According to People, William and Kate arrived in Pakistan on October 14 and will end their trip on the 18th.
While they’ve been overseas, their children have allegedly been staying at home with their nannies – which is said to be a change from the usual system now that both Prince George and Princess Charlotte attend school.
"Typically what happens is if Kate and William are away, the children stay with Michael and Carole Middleton at their house in Buckinghamshire," Mollard told The Daily Edition this morning.
"But because it’s school time for the kids, they’re actually at home and Carole is helping out, but it was also their nannies.
"So about 4’oclock every day they ring their kids after school to say, you know, ‘how was your day?"