Their mother decided to break the news by giving each of them a giant iced cookie – with a special message.
The youngest girl's cookie read "Big sister" and the eldest's "Big sister again" and we have to give it to mum: this is one of the best pregnancy announcements we've ever seen.
It takes them a while to register, but it isn't long before the youngest girl is jumping around with absolute joy at the prospect of a new baby in the family.
Slightly more subdued is the older girl, who can't quite seem to believe the news but seems just as happy for her mum.
The girls don't seem like they can take much more excitement, but mum hands them the baby scan anyway. Cue more high pitched squeals.
They just can't put into words how much their new sibling already means to them, and soon it's a group hug between them and mum.
Would you break you baby-related news to older siblings this way?