WATCH: THE best reaction to daughter's pregnancy announcement
Telling the mother-in-law was more of a surprise than this pair had bargained for.
The couple handed the grandmother-to-be a gift box with a pink and blue bracelet inside. She spotted a charm with the words "Number One Grandma" written on it, but for a brief moment assumed it was because she was a grandma already, to her son's little boy and girl.
The filming began and her explosive reaction is caught on camera. Prize for the most excited babbling goes to this nanny!
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