The Duke and Duchess of Cambridge already have a well-established family, with Prince George, 5, Princess Charlotte, 3, and Prince Louis, 10 months, rounding out their adorable little brood.
But Catherine, 37, hinted that she might be keen to add another baby to her clan.
Duchess Catherine and Prince William are currently in Ireland visiting a range of different organisations, including a local police station and arts centre.
Catherine wore a powder blue $3240 Mulberry coat and Jenny Packham dress for her day out, and paired the look with navy blue sued pumps and a matching blue suede clutch.
While chatting to waiting fans outside the the Braid Arts Centre in Ballymena, northern Ireland, Kate met Alan Barr and his adorable five-month-old baby James.
The Duchess spotted the cute duo in the crowd and told Alan: "He's a very sweet little boy... He's so diddy. Makes me very broody."
Broody has a similar meaning to the word clucky, referring to the strong desire to have a baby.
When asked by Alan is she was planning for baby number, Catherine laughed and joked: "I think William might be slightly worried."
One of the stops on Catherine and William's northern Ireland tour was a visit to Sure Start, a program that supports parents with children aged four years old living in disadvantaged areas.
The royal couple reportedly spoke about their own parenting experiences, particularly with sleep deprivation.
One of the mums in attendance, Kathryn Ward, said Catherine and William said despite having staff available, they prefer to get up in the night if any of their children wake.
"They were chatting a bit about sleep deprivation," Kathryn told Hello! after the visit.
"Even though they get the help that they have, they're still parents as well and want to get up with their own children," she said.
"So they understand the stresses and pressures we're going through, even though they got a couple of people more hands-on.
"They were fantastic," the 26-year-old mum added.
"Really on our level."
Watch bbelow: Duchess Catherine's best hair moments
The day concludes the Cambridges' two-day royal visit to Northern Ireland, to celebrate the young people of the country.