Princess Eugenie wore a daring dress featuring a plunging neckline during a night out last night (16.09.08).

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The 18-year-old royal – who is sixth in line to the throne and the daughter of Prince Andrew and Sarah Ferguson – stunned onlookers when she donned the floral-print frock during a night out to London’s exclusive Whisky Mist nightclub.

The mini-dress left little to the imagination, with Eugenie’s cleavage threatening to spill out as she climbed into a taxi at the end of the evening.

Princess Eugenie has become a regular on the London party circuit since finishing her A-Levels earlier this summer – she received A grades in Art and English Literature and a B in History of Art, the best result of any member of the royal family.

A friend has previously said of the fun-loving royal: “Eugenie is the one to watch. She loves to party and knows how to have fun. She’s a bit of a live wire.”

She was recently seen enjoying an evening out with her cousin Prince Harry and his girlfriend Chelsy Davy at London’s Boujis nightclub.

She also attracted attention when she attended the party of Amelia Bamberger – the daughter of Cartier diamonds managing director Arnaud Bamberger – wearing a set of huge neon pink false eyelashes.