William held cutie Hugo Eric Scott while Kate chatted to his proud parents, Vic and Hanna. Kate was overheard describing the little lad as 'very cute', while William commented his name was 'fantastic'.
It was a special occasion for Hugo, Vic and Hanna, as the adorable boy was born exactly three weeks ago today. He was named after Mr Vicary's father, and the famous explorer who died in March.
"The Duke liked the name. He thought it was very apt. My wife asked if he would like to hold him and he took hold of him."
Mr Vicary described William as a 'natural' with children, and said he thought Kate had 'doting eyes' on the little boy.
Kate and Wills were at London's Goldsmith's Hall to celebrate the achievements of members of the South Pole Scott Expedition group.
What do you reckon?
Pitter patter of tiny feet at the palace soon? You never know, it could be twins...