The mum-to-be let out a big laugh, and simply replied, "I'll take it!"
She was visiting Mayhew, an animal charity she's recently become the patron of, when she stepped out in the H&M maternity dress.
"Her Royal Highness feels she can use her position to focus attention on, and make a particular difference to these organisations and, more widely, the sectors they each represent".
The animal welfare organisation uses public donations to improve the lives of dogs, cats and people who live locally and internationally. This is Her Royal Highness's first official visit to Mayhew in her new role as Patron of the charity.
She now owns two rescue dogs - a beagle named Guy and a Labrador-Shepherd mix named Bogart, who remains in Toronto, Canada with her friends.
The duchess picked up the dog when she spotted it was shivering and clutched it to her chest when she chatted to Mayhew staff who told her about the charity's projects in India and Afghanistan.