Middleton revealed to a 9-year-old girl at the opening the newest addition to the family.
“She said she had a hamster, and Charlotte really likes it because the whiskers always tickle her face,” said the girl identified as Darcey, according to Hello Magazine.
Middleton, 34, also told kids that she had two pets as a child, two guinea pigs called Salt and Pepper.
Marvin is the newest addition to the royal family. The royal family previously received a cocker spaniel, Lupo, as a wedding gift in 2011 from the duchess’ brother James Middleton.
Marvin and Lupo both live with the family at their country home Anmer Hall in Norfolk.