By Caitlin Petreycik
Updated Jul 19, 2012 @ 11:15 am
Courtesy Photo (2); Tim Rooke/Rex / Rex USA

It looks like Catherine, Duchess of Cambridge went shopping this week! The royal attended a special Olympic Games exhibition at London's National Portrait Gallery wearing a new look—Stella McCartney’s cobalt blue shift. We love the symbolism of choosing this British designer, the same person behind the Great Britain's Olympic uniforms. The Duchess paired the dress with a Cartier trinity necklace, which features pink, yellow, and white gold dotted with diamonds. While you can shop the dress for $658 at, the necklace is a little steeper, available at for $76,895. (Perhaps it was a 30th birthday gift?) Tell us: Do you like the look?

See more of Kate's most memorable outfits!