Another week, another fabulous Kate Middleton outing [1]. The Duchess of Cambridge made a regal appearance in London on Monday as she attended Commonwealth Observance Day. Not only did she look amazing in her matching gray ensemble [2], but her company wasn't so bad-looking, either. Aside from showing off her impeccable chemistry with her husband [3], Prince William, Kate was also spotted walking into the event with her attractive brother-in-law [4], Prince Harry. See more pictures from her recent appearance, and then check out what other events the royals have planned this year [5].