The royal family is feeling the Halloween spirit!
The “Malice in Wonderland”-themed party featured a lot of whimsical costumes, but the royal’s look raised a few eyebrows.
Beatrice sported a regal black velvet top and leather skirt, which she accessorized with a dramatic cat eye mask. To add even more mystery to her festive costume, she topped it off with a platinum blonde wig.
While Beatrice’s costume remained a mystery (Sgt. Pepper Cheshire Cat? Feline Femme Fatale?), the newly-single princess appeared to be having a blast at the glamorous event as she mingled and posed for photos with fellow partygoers.
Princess Beatrice and her longtime boyfriend Dave Clark split in August after nearly a decade of dating.
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A friend told PEOPLE, “It is very much a break. It is amicable and mutual. They both need space after a period of ten years to see what they both want.”