We know what you're thinking... Why wasn't he in the family portraits?! Poor Marvin.
Nine-year-old Darcey said of the conversation:
"[She] said she had a hamster, and [Princess] Charlotte really likes it because the whiskers always tickle her face."
Awww! So cute.
In another adorable moment during the outing, one child asked the chairman of the Historic Royal Palaces Rupert Gavin who the Duchess of Cambridge was:
"Then the child said, 'Ooh, are you the princess?'"
To which Kate said simply:
"Just call me Kate."
[Image via Kensington Royal Palace.]