Another skeptic quipped: "Yeah ok".
In fact, her wedding makeup artist, Daniel Martin, told PEOPLE that Meghan isn't the biggest fan of a bold lip.
During her visit, the Duchess was filmed getting up close and personal with rescue dogs, and she particularly loved a little Jack Russell named Minnie.
Meghan wrapped up in her Emporio Armani Cream Cashmere Coat, a jacket she has previously worn during an engagement in Sussex.
The Duchess of Cambridge wore a recycled Oscar De La Renta dress for the occasion.
It is thought Meghan researched Mayhew on the internet before approaching the charity to learn more about its work, and made two private visits, the first in November, before her public tour.
Meghan Markle, who is due to give birth in April, showed all the graciousness of a royal when she expertly responded to a comment about her growing body. The organization's goal is to better the lives of animals and people in communities they live in, both in London and internationally, through programs that work to reduce the number of animals in need including community and educational initiatives.
Her other dog Guy, a Beagle, did make the journey and is now part of the family.
Holding Maggie, who was brought to the Mayhew in November after her owner was unable to care for her, the Duchess said: "We can't get another dog before the baby, our hands are full".
She was named as a patron of Mayhew, based in north west London, last week, one of four patronages announced at the time, reflecting her interest in supporting the arts, vulnerable women and education.