Celebrity Kate Middleton Hits Snapchat: Watch Her Pose for Serena Williams at Wimbledon By Olivia Bahou Olivia Bahou Facebook Olivia Solomon is a New York-based writer and editor who covers all things fashion, lifestyle, celebrity, and pop culture. She was previously the Assistant Digital Editor for InStyle, and her work has appeared in many national publications. InStyle's editorial guidelines Updated on July 7, 2016 @ 02:45PM Pin Share Tweet Email Photo: Karwai Tang/WireImage; Shaun Botterill/Getty Serena Williams has a lot to celebrate today: She won her Wimbledon semifinal match to advance to the championship's women's singles final on Saturday—and celebrated in true royal fashion with the Duchess of Cambridge! Williams took to Snapchat after her match to share a video of herself with two royals: Kate Middleton and Sophie, Countess of Wessex, who had both watched her victory on center court. In her Snapchat debut, Middleton smiles at the camera in her recycled yellow Roksanda dress and brings Sophie in for an embrace in the frame. Serena Williams/Snapchat “I’m in the ‘in-crowd’ now—I’m with royalty!” Williams says in the clip. Watch it below, and follow the tennis star on Snapchat (username: SerenaUnmatched): The defending Wimbledon champ was on court for less than an hour today as she beat Elena Vesnina in straight sets to reach the women’s singles final. Her older sister, Venus Williams, wasn’t so lucky: She lost to Angelique Kerber in her semifinal match, squashing hopes of a Williams sister final this weekend. Tomorrow the action continues as Roger Federer takes on Milos Raonic and Brit Andy Murray goes head-to-head with Tomas Berdych to try to reach the men’s singles final. VIDEO: 17 Celebrities Who Are Tennis Fans Click through our gallery to see all of your favorite stars take to the stands at Wimbledon through the years.