Recently, we've been seeing Christmas cards from a few of our favorite celebrities, like Kelly Ripa, but we were pleasantly surprised yesterday to stumble upon a rare royal family card from almost 100 years ago.

Thanks to the Royal Collection Trust Instagram account, followers were shown a letter from 1939. In the vintage, black-and-white image, a 13-year-old Queen Elizabeth is seen posing with her younger sister, Princess Margaret.

In the snap, the two sisters are seen wearing matching pinstripe tops with scalloped peter pan collars tucked into skirts. The card included a message that said, “With best wishes for Christmas from Princess Elizabeth and Princess Margaret Rose.” Next to the inscription are two drawings of baby cherubs looking at shields that include the Union Jack and a flag for the French Republic (République française).

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Royal Collection Trust/Instagram

Lately, the royal family has really been getting into the holiday spirit on social media.

For the past couple weeks, the official account has posted snaps of the inside of royal residences decked out in their lavish holiday decor.

For instance, at the end of November, they made a post that said, “The finishing touches are made to the 20-foot Christmas Tree in St George’s Hall, Windsor Castle as part of the Royal Collection's annual Christmas display.”

But the rare Christmas card posted by the Royal Collection Trust is part of a virtual “advent calendar” that they've been doing on their Instagram Story for the month of December. At the beginning of the month, they kicked off the event with a Story that said: “Open a door in our advent calendar each day and see what royal festive treat is revealed...”

We'll be keeping our eyes peeled for more royal family throwbacks.

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RELATED: Princess Anne Hosts Special Christmas Party & Gives Royal Fans a Peek Inside St. James’s Palace

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