Cressida, Beatrice and Eugenie, who had previously attended The Charge — a boxing charity match at Syon House sponsored by Ciroc vodka, were joined by the Princesses' boyfriends, Dave Clark and Jack Brooksbank, at the private members club in London.
The 25-year-old sported a stunning cobalt halterneck gown, sparkling statement earrings and wore her long blonde locks in loose curls around her shoulders.
Cressida Bonas and Princess Beatrice
Prince Harry's ex walked hand-in-hand with Beatrice, who opted for a white long-sleeved top and a navy skirt, and the pair seemed deep in conversation, laughing and talking animatedly as they left the club in the early hours of Friday morning.
Princess Eugenie, who acted as matchmaker with her cousin Harry and Cressida, wore a striking floor-length purple dress for the evening.
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Princess Eugenie and her boyfriend Jack Brooksbank
Eugenie, 24, who is currently on a break from her job at New York auction company Paddle8, looked thrilled to be spending time with her boyfriend Jack.
Despite the 3,500 miles between them, the couple's relationship is going from strength-to-strength with Jack saying that they spend a lot of time on Skype together.
Cressida's night out with Beatrice and Eugenie comes a fortnight after her split from Harry.
Princess Beatrice and Dave Clark
After dating for two years, the couple decided to part ways and Cressida is now focusing on her career, with a friend of the couple claiming that "Harry is really keen that she is allowed to get on with her life."
The source also insisted that the couple's unexpected split, which emerged at the end of April, was "very much an amicable one".
"They are still very much the best of friends," the insider confirmed. "They have just decided to go their separate ways."