Only a handful of guests were allowed to attend the wedding due to coronavirus restrictions, including the Queen and Prince Phillip.
Princess Eugenie, also in attendance, posted a cute photo of her brother that was taken the day before Beatrice’s big day.
The selfie taken outside shows Eugenie in a black floral top and her sister Beatrice in a blue, red and white striped top.
Eugenie also posted an adorable snap of the two sisters with their mother, Sarah Ferguson.
The photo was taken when the two princesses were young children, Sarah holding each other’s hands.
Eugenie posted the photos on Instagram with the caption: “Happy birthday dear Beabea.
“Here we are on the eve of your wedding. Always rocking a scrunchie or hair accessory (since the 90s) and huge smiles on our faces. #happybirthday »
Sarah also wished her daughter a happy birthday by posting an adorable photo of Beatrice as a child.
The photo shows Beatrice as a child on a sunny day in a white dress while sniffing a beautiful pink flower that she plucked from a bush.
Sarah shared the cute photo on her Instagram account.
The caption read: “Happy birthday my dearest Beatrice. 8.8.88 at 8:18 p.m. was one of the greatest and proudest moments of my life.
“You are unique and simply one of the most special people on this planet.
“Your always loving and devoted mom. ”
The Queen also wished her granddaughter a happy birthday on Instagram.
One photo, which was shared on the Royal Family’s Instagram account, shows Her Majesty and Beatrice together during a Maundy Thursday service.
The shot shows a beaming Beatrice wearing a long blue coat and accompanying hat, with a set of colorful flowers in her hand.
The Queen, standing opposite Beatrice, also smiles while wearing a white winter coat with blue buttons, as well as a bright blue hat and black handbag.
The caption on the Instagram post reads: “I wish Princess Beatrice a very happy birthday!
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“Her Royal Highness is the Queen’s 5th grandchild.
“This was taken when the Princess joined her grandmother at a Maundy Thursday service in York Minster. ”
The post has been loved thousands of times, including former footballer David Beckham.