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Harper Seven may be a descendant of music, fashion and sports royalty, but she was recently in the company ofactualroyalty.

The only daughter of David and Victoria Beckham turns 6 on Monday, but enjoyed a bit of an early birthday treat when she was invited alongside her dad and grandmother to attend a tea party at Buckingham Palace where she and some friends even posed with Princess Eugenie of York.

Lucky Harper meeting a real life princess at the Palace x , David, 42, captioned the group shot, in which his daughter is outfitted for the occasion in Cinderellas sparkly blue gown.

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In another photo this time of himself alongside Harper and his mother David clarifies, This wasnt the palace opening the gates for Harpers birthday party , this was a tea party where us and other guests were invited so it was a beautiful thing to do with My mum , Harper plus a few school friends

We were honored to be able to there Beautiful tea party. he added.

Chimed in mom Victoria, 43, with a solo photo of Harper on the palace grounds, holding a single red balloon, Our little birthday princess x Kisses .

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Harpers three big brothers Cruz David, 12, Romeo James, 14, and Brooklyn Joseph, 18 all used the social media app to send love to the youngest member of the family.

Dear Harper I cant believe it has been already 6 years you are such a big girl so to the best sister in the world I love you so much have a amazing day , Cruz captioned a photo of himself with Harper on his shoulders.

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On a super-smiley palace snap posted to Davids account, the retired soccer star got a little sentimental about his only daughters newest milestone.

Happy Birthday to our special little young lady Such a special girl who brings so much joy and happiness into our lives, he wrote. Happy 6th birthday ( I cant believe your 6 already ) have the most amazing day we love you pretty lady x

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Happy Birthday, Harper! David Beckham Celebrates with Sweet Photos from a Palace Tea Party (with Princess Eugenie!) - PEOPLE.com