Kate Middleton Is 50 Shades of Gray Celebrating Commonwealth Day With Prince William and Prince Harry

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The royals are all together again!

Kate Middleton 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. The glamorous trio met up with the princes' grandmother, 89-year-old Queen Elizabeth, once inside.

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But while Kate, 34, looked as gorgeous as ever, dare we say her outfit -- a gray hat by John Boyd, a gray coat dress by Erdem, and matching Rupert Sanderson gray heels -- was definitely not our favorite?

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Perhaps a little bit of color would have gone a long way in mixing it up!

Still, the royals -- including Prince Philip and Prince Andrew -- were quite a sight to see all together at Westminster Abbey, where the Duke and Duchess of Cambridge were married almost five years ago in April 2011.

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We only wish we could have seen their adorable kids, 2-year-old Prince George and 10-month-old Princess Charlotte! Earlier this month, we did get to see Kate and William take the two on their first snowy vacation in the French Alps, when Kensington Palace shared the super cute pictures.

Watch below!