It's their first public engagement together.

Meghan Markle and Kate Middleton were all smiles as the arrived at Wimbledon this afternoon. The Duchess of Sussex and Duchess of Cambridge were pictured waving and beaming at tennis fans as they stepped out at the SW19 club. The sisters-in-law greeted a group of thrilled-looking ball boys and girls, before meeting some junior tennis players. https://twitter.com/Wimbledon/status/1018091101700395008?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1018091101700395008&ref_url=https%3A%2F%2Fwww.cosmopolitan.com%2Fentertainment%2Fa22146963%2Fgahhh-kate-middleton-and-meghan-markle-went-on-a-sister-sister-date-at-wimbledon%2F The pair arrived ahead of the Ladies' Final this afternoon, which will see Serena Williams face off against Angelique Kerber at 2pm. Both of the Duchesses were serving up some Wimbledon-chic looks for the occasion. Meghan paired a loose fitting, blue and white striped Ralph Lauren shirt with a pair of wide-legged, high-waisted white pants and a white straw boater hat. Meanwhile, Kate wore a black and white, polka dot patterned midi dress, believed to be by Jenny Packham, which had ruffle detail around the neck and the waist. She finished off her look with na pair of nude heels. https://twitter.com/Wimbledon/status/1018092677462675457 Meghan and Kate have attended a number of engagements together this year but the final will be the first time that they're hanging out on their own together. The engagement will be a chance for Meghan to catch up with her friend Serena Williams, who has won the tournament seven times and is taking on Angelique Kerber in this year's final. Serena and her husband Alexis were guests at the royal wedding back in May.