"2 days till Christmas," he wrote alongside a snap showing their stunning Christmas tree and front door adornments.
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The teenager also shared a picture of him and Santa Claus, and it seems meeting the man himself really excited the 16 year old.
"OMG I met Santa," he captioned the photo, which showed Harper's older brother sitting next to Santa.
It's no surprise that the Beckhams have gone all out for Christmas, David recently revealed that he loves the festive period.
"I have always loved Christmas. It's always been an incredibly special time for me and the family. I love all the traditions associated with Christmas - the old movies, Queen's speech, songs, turkey dinner with all the trimmings, TV programmes like Only Fools and Horses and much more.
"Now it's all about the children and making sure they have a special time. Even when we were in LA or Madrid, we would always come back to UK to spend Christmas here.
"This country comes alive during this time and this period is about sharing with loved ones."