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The Duke and Duchess of Cambridge dressed down for the annual event and were joined by Prince Harry for the gymnastics portion of the games.
The 32-year-old brunette beauty sat in the middle of the royal brothers as they all watched the men's and women's team finals competition from the family section of the arena.
Gymnastics is just one of several sports that Kate, William and Harry are slated to attend during the almost weeklong games.
Prince George's mother looked sleek in a pair of skinny jeans with a matching navy blazer and wedges.