Princess Beatrice was a glam unicorn for Halloween - see her costume!

By Jessica Pollack

Princess Beatrice got in the Halloween spirit on Wednesday night (Oct. 31) for a party at Annabel's in London's Mayfair neighbourhood, where she paired a chic ensemble with a fun wig and iconic accessory. On the heels of her stylish appearance as maid of honour at her sister Princess Eugenie's royal wedding, the 30-year-old was clad in a ruffled white dress with a wide leather belt, black coat and black heels, which she paired with long lavender locks and a blue spiral unicorn horn with little ears!

Princess Beatrice was a glam unicorn for Halloween! Photo: © Getty Images

The eighth-in-line to the throne was one of the famous faces at TV presenter Jonathan Ross's annual Christmas party, alongside actors like David Tennant (Camping) and Chris O'Dowd (Get Shorty). Prince Harry's ex-girlfriend Chelsy Davy was also in a festive mood, wearing an all-black ensemble with a semi-sheer top, ripped jeans and spooky black eye makeup.

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Princess Beatrice has earned some down time after a very busy October! As maid of honour for Eugenie at her royal wedding to Jack Brooksbank, she was front and centre as her sister said "I do" followed by three very different receptions. The young royal won raves for her gorgeous Ralph & Russo ensemble, an indigo dress with peplum detailing, a nipped waist, an wide neckline and a sweet bee pin on her lapel paying tribute to her nickname. She finished the look with the palest blue pumps and a gorgeous blue and purple oversized Sarah Cant headband.

Beatrice looked gorgeous in blue at her sister's royal wedding. Photo: © Getty Images

After her sister's big day, Prince Andrew and Sarah's daughter jetted to Laos for a week to run the Luang Prabang Half Marathon with friends - a sprint that benefitted Lao Friends Hospital for Children. While in the South East Asian country, Beatrice also stepped out in a floral frock for the Lao Friends Second Annual Gala Dinner, opened the hospital's newly expanded Neonatal Unit and carried out additional engagements with charity Friends without a Border.

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