"I'm gonna wet my pants," giggles one of the three little girls in the video below.
Well, we're pretty sure we'd have a similar reaction if we found a new baby brother under the Christmas tree — which is precisely what these sisters found.
You see, when their parents, Courtney and Steve Solstad, decided to adopt a baby boy, they kept the baby a secret from their daughters.
"The girls knew nothing about Nathan until this," Courtney explained on Facebook. "We met them at the door, and told them that we had been out Christmas shopping and got them a gift to share.. .and it was under the tree!"
Watch the perfect reaction of the three sisters below.