By Alexis Tereszcuk - Breaking Celebrity News Entertainment Editor

The Duchess of Cambridge showed off her toned physique to the best effect  Friday, baring her back in a super sexy dress!

Kate Middleton swept her hair up into a fancy chignon and poured her gorgeous figure into a daring teal dress with a lace back and Breaking Celebrity News has the stunning photos.

The future Queen of England, 30, wore a $4,620 Jenny Packham Aspen gown with a plunging neckline and an even racier lace back.

With her husband Prince William, 29, by her side, Kate also wore her $650 Jimmy Choo Vamp Sandals, for the second time this week.

The royal couple attended a black tie gala at the Royal Albert Hall to mark the final countdown to the 2012 London Olympic Games.

The designer, whom Kate often wears, described the fashion icon’s look, saying “The style combines an emerald lace bodice embellished with Swarovski crystals and a pleated skirt, ribbon waisted with a crystal and flower embellishment and matching bespoke clutch bag.”