Monaco royals get ready for annual Grace Kelly Foundation event

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Charlotte Casiraghi and Prince Albert II of Monaco

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Charlotte Casiraghi, Melanie-Antoinette de Massy and other girlfriends take to the dance floor at last year's Rose Ball

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Pete Doherty performs live during the 'Swinging London' Monaco Rose Ball 2012

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Princess Caroline of Hanover, Princess Charlene of Monaco attending the 'Swinging London' Monaco Rose Ball 2012

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Prince Albert II of Monaco and Princess Charlene at the Rose Ball 2010

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From left: Tatiana Santo Domingo, who is now expecting her first child, Margherita Missoni, Eugenie Niarchos, Beatrice Borromeo and guests attend the Monaco Rose Ball 2011 at Sporting Monte Carlo in 2011

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Chuck Berry greets Karl Lagerfeld in the 2009 Rose Ball. Fashion maestro Karl is in charge of this year's ball

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Demonstrating the elegance, beauty and poise Charlotte inherited from her mother and late grandmother, Grace Kelly, the Gucci model wore a demure black Lanvin gown to the 2011 benefit that she hosted along with brothers Andrea and Pierre

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Princess Caroline of Hanover, Prince Albert II of Monaco and Charlene Wittstock 2009 Monte Carlo rock'n'roll-themed ball. Charlene is stunning in a floor-length black gown, sporting a retro vibe with bouffant hair