(dailymail.co.uk) - The young royals descended en masse to their favourite haunt Mahiki last night - as Princesses Beatrice and Eugenie were seen with their cousin Prince Harry for first time since his return from active duty in Afghanistan.
But thankfully, there was no sign of any over-exuberant, rowdy behaviour, as the royals left in an orderly fashion, with no need for a helping hand.
Princess Beatrice, was seen leaving the club in ritzy Mayfair, dressed in a black ruffled dress and sundress, and studded Christian Louboutin heels, ideal for showing off her suntan.
The 19-year-old princess has just got back from a two week 'backpacker style trip to Thailand.
Meanwhile her trendy young sister Eugenie, 18, wore a floral print cornflower blue dress from model Kate Moss' Topshop range, with matching nail polish, and flat boots.
With her brunette hair cut in a fashionable Katie Holmes style bob, Eugenie, fresh from a cover shoot for Tatler magazine, is emerging as the trend-setter in the royal pack.
And fittingly, Eugenie is said to have a host of admirers at ?26,000-a-year Marlborough College, where she is a straight-A student studying for A levels in Art, History of Art and English this summer.
Earlier, Harry, 23, was seen with his brother Prince William, and his girlfriend Kate Middleton, at a function in London, but he later left them to join his cousins at Mahiki, arriving with his royal protection.
The club is famed for its super-expensive cocktails, including the famed ?100 Treasure Chest cocktails - a potent combination of brandy and peach liqueur topped with a bottle of champagne served in a wooden chest.
Harry's brother William has run up bar bills of ?5,000 on the drinks on previous nights out.
But last night there was little sign of any overindulgent behaviour as the group - including Beatrice's American boyfriend Dave Clark, left looking rather sober.
Harry's friend Holly Branson was seen at the club, along with former WAG Charlotte Mears.
Both Beatrice and Harry looked glowing after enjoying sunshine breaks abroad.
Harry has just returned from spending time in Cape Town, South Africa with girlfriend Chelsy Davy, 22, and her family.
While Beatrice enjoyed a backpacker-style break in Thailand - allegedly drinking the local whisky and dancing on the beach into the early hours.
Beatrice, who is halfway through her gap year, is clearly enjoying her freedom before settling down to studying a textiles and design course at Goldsmiths College in September.
She is set to leave for the Big Apple soon to do work experience with a fashion magazine.