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.
Her hair was perfectly coiffed in her signature blowout style and she opted to wear minimal makeup to the daytime appearance.
Meanwhile, William and Harry both looked equally dapper in white oxford shirts, jeans and loafers.
The three made a somewhat low-key arrival at Hydro, but once cameras showed them all sitting together on the stadium's big screen, audience members broke out into cheers and applause.
Today's Commonwealth Games schedule includes badminton, hockey, lawn bowls, netball, squash, shooting, swimming, weightlifting, table tennis and boxing.
Let the games begin!