Celebrity Parents Happy Birthday, Harper! David Beckham Celebrates with Sweet Photos from a Palace Tea Party (with Princess Eugenie!) "Lucky Harper meeting a real life princess at the Palace," David Beckham captioned a Sunday photo of his daughter, her friends and Princess Eugenie of York By Jen Juneau Jen Juneau Twitter Jen Juneau is a digital news writer for PEOPLE since 2016. People Editorial Guidelines Published on July 10, 2017 11:00 AM Share Tweet Pin Email Harper Seven may be a descendant of music, fashion and sports royalty, but she was recently in the company of actual royalty. 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 Cinderella’s sparkly blue gown. Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Babies newsletter. https://www.instagram.com/p/BWW9nEqBe-U/ RELATED VIDEO: Victoria and David Beckham Celebrate Son Brooklyn’s 18th Birthday In another photo — this time of himself alongside Harper and his mother — David clarifies, “This wasn’t the palace opening the gates for Harper’s 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 💕💕💕💕💕💕.” RELATED GALLERY: Penelope! Samuel! Harper! See Which Celeb Babies Celebrate Their Birthdays in July Harper’s 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 can’t 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. https://www.instagram.com/p/BWW5yMaDkfM/ FROM PEN: Raising a Little Princess: All About Charlotte’s Amazing Childhood The Newest Spice? Harper Sings Mom Victoria Beckham “Happy Birthday” — See the Sweet Clip On a super-smiley palace snap posted to David’s account, the retired soccer star got a little sentimental about his only daughter’s 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 can’t believe your 6 already ) have the most amazing day we love you pretty lady x ❤️”