The Duchess of Cambridge -- aka Kate Middleton -- is sure to be taken to task by fashionistas for wearing the same hat to two back-to-back events Saturday.

PHOTOS: Kate & Pippa Attend a Jockey Wedding

Just a couple of hours after Prince William's bride appeared at an event honoring Queen Elizabeth, she and her sister Pippa met up for a friend's wedding.

And while Kate did a quick change out of the ivory-colored suit she wore to the Trooping the Colour ceremony in the morning into a sweet back and white dress for the afternoon wedding, her black hat stayed in place.

PHOTOS:  William & Kate Look Stylish As They Honor Queen Elizabeth

The Duchess and her now famous sister both actually both wore black headpieces and matching smiles as they were snapped arriving at the wedding in Berkshire, England.

And the day no doubt held a special place in the royal's heart.  The friend getting married, Sam Waley-Cohen, was the man credited for saving her romance with Prince William after their brief split in 2007.

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Watch out Kate, your little sister might be raiding your closet!

Pippa Middleton ended the work week with a little retail therapy, expanding her already huge wardrobe on a Friday shopping trip, and RadarOnline.com noticed that the jacket she was wearing looked a little too familiar. 

PHOTOS: Pippa Middleton Steals Kate’s Style

That’s  because Kate Middleton, the new Duchess of Cambridge, wore an identical jacket to lunch with her mother-in-law Camilla back in February.