And the 19-year-old continued, sharing her reaction when the reality TV starlet called her out:
[Image via Glamour Magazine.]
They are adorbsies!
"On set with my Beautiful Blondie @ParisHilton #Fun #Makeup #Camera #Action #Paradise #Dreamscometrue"
The lovable pair snuck in a few silly poses for the camera while River got his makeup did for the shoot.
Isn't it so sweet how they always accompany each other on sets?
We hope they stay together forevs!
[Image via River Viiperi's Twitter]