The former professional footballer player credited Harper as bringing “joy and happiness” to the Beckham family.
Sharing a photo of himself hugging his daughter outside Buckingham Palace on Monday 10 July, Beckham wrote: “Happy birthday to our special little young lady. I can’t believe you’re six already. Have the most amazing day we love you pretty lady.”
As a treat for Harper’s birthday, she visited the palace to meet real-life princess, Princess Beatrice.
Pictured with four other young girls dressed up as princesses, Beckham shared a photo of the six-year-old and Princess Beatrice and wrote: “Lucky Harper meeting a real-life princess at the palace.”
Victoria Beckham shared a photo of Harper dressed in her princess gown holding a balloon outside the palace.
“Our little birthday princess,” she wrote. “Kisses!”