"So, so cute," the "Kocktails With Khloe" host, 31, said during an appearance on Good Morning America of her new nephew, Us magazine.
"Just a newborn. They don't do much at this age," she added.
Khloe's sister Kim Kardashian welcomed her son in early December with husband Kanye West.
The couple dubbed him "Saint" after using that moniker to refer to the baby throughout her difficult second pregnancy.
Luckily, West has adjusted well into her role as a big sibling.
"North is obsessed with him,. North will say, 'My name is Saint!' She wants her name to be Saint now.