Catherine wore a black lace midi dress with a corset bodice and semi sheer skirt, while Carys wore a floral off-the-shoulder top with black trousers.
Catherine took to Instagram to share a video of herself and Carys entering the event.
"Just arriving at the Dolce and Gabbana show with Carys. We are so excited," she wrote.
See more looks from the show in our gallery here.