Slim Kate Middleton Flashes Legs in High-Slit Dress

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive for a dinner hosted by The Thirty Club at Claridges on May 8, 2012 in London. Credit: Samir Hussein/

Move over Angelina Jolie: there's another, leg-baring siren in town!

In London Tuesday, Kate Middleton dazzled in a chic white Roland Mouret gown that featured a thigh-high slit at a dinner hosted by The Thirty Club at Claridges with her husband Prince William.

The always-stylish royal flashed her slim and toned legs and reached new heights in trendy, silver metallic Jimmy Choo sandals, which she teamed with a matching clutch. The long-sleeved dress' form-hugging bodice accentuated her thin frame and super-flat stomach.

Last month, the future Queen of England, 30, and her royal hubby, 29, celebrated their first wedding anniversary -- April 29 -- with a low-key, private day at their humble cottage in Anglesey, Wales.

The evening prior, they attended a friend's wedding in Wingfield, England, where the Duchess recycled one of her looks (a blue lace Erdem dress) from the couple's North American tour last July. Also on hand for the rainy-day nuptials? Middleton's scene-stealing sister Pippa, tip-toeing back into the spotlight aft a toy gun photo scandal in Paris.