Kate Middleton goes gray for Commonwealth Day event for queen

Kate Middleton is feeling gray!

The 34-year-old royal joined her husband, Prince William, and her brother-in-law, Prince Harry, for a special service on Monday at Westminster Abbey to celebrate Commonwealth Day in the U.K and the Queen's commitment to service, but unfortunately the normally stylish royal totally disappointed.

The trio arrived together to the Abbey (the same place where Will and Kate wed) and joined Queen Elizabeth, 89, inside. But unfortunately, the Duchess' ensemble left us feeling a bit blue. Middleton rocked a gray hat by John Boyd, a gray coat dress by Erdem with a lace-like print, and matching Rupert Sanderson gray heels -- but the look truly fell flat.The massive hat seemed to shield her face and the boring color of her frock was much too dark for the church event.

Normally, perky Middleton opts for brighter frocks with a more festive tone. The princes kept thing simple in classic suits and despite Kate's dismal attire, they all seemed to be having a good time. Middleton was spotted smiling and chatting with others that were attending service.

What do you think of Kate's gray look?

Check out some of Middleton's style transformation: