Among the group was none other than Jack Brooksbank.
The royal husband looked casual dressed in a navy shirt with dark chinos.
Royal fans may remember seeing Demi Moore at Princess Eugenie and Jack Brooksbank.
She's apparently fab pals with Princess Eugenie's mother, Sarah Ferguson Duchess of York and her father, Prince Andrew.
"Moore, 55, is a longtime friend of Eugenie’s parents, Sarah Ferguson, the Duchess of York, and Prince Andrew,"People reported at the time.
"She even attended a birthday celebration for Princess Beatrice in the past."
The Mirror have shared that Demi has share more detail of the nature of their relationship.
"Demi and mother of the bride Sarah Ferguson became friends after Fergie developed an interest in Kabbalah, which Demi practises."
No word on Princess Eugenie's whereabouts.
Last week, the royal decided to share an intimate pic of herself as a little girl where she was clowning around at a party.
In the sweet snap, a young Eugenie can be seen smiling as she attempted to juggle some coloured balls, while a man in a clown costume crouches next to her.
"#tbt to when clowns weren't scary... Happy Halloween 🎃" the 29-year-old captioned the photo, as #ThrowbackThursday this week coincided with Halloween.
