Meghan, who also wowed the Wimbledon crowds in a Ralph Lauren shirt and high-waisted pants, was of course supporting her close friend Serena Williams, who played Angelique Kerber in the final - returning to the tournament for the first time since having her daughter just 10 months ago.
Kate and Meghan, who are conducting their first engagement together without their husbands, stopped and spoke with a number of ball boys and ball girls, as well as junior players before making their way across the walkway for lunch.
The pair sat side by side and appeared to be in good spirits as they animatedly watched Novak Djokovic and Rafael Nadal duke it out in the heated men's single final.
The Duchess of Cambridge (Kate) and the Duchess of Sussex (Meghan) made their first joint public appearance together at the famed tennis tournament on Saturday. While the newlywed British Royal paired her wide-legged trousers with a bright blue and white striped Ralph Lauren button up blouse and a sleek low bun, Watson kept her entire ensemble white on white.
Saturday's outing to Wimbledon is the royal pair's first official engagement together without their husbands.
The Duchess of Cambridge and the Duchess of Sussex take a seat at Wimbledon for the Ladies Single Finals.
This is not the first time Meghan, who is friends with Serena, attended the tennis championships.
Meghan Markle to cheer Wimbledon royal Serena
Their jam-packed itinerary included meetings with the Taoiseach Leo Varadkar and Irish President Michael D. She also sported some designer accessories during the trip, including a Fendi bag worth £2,890.
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.
Serena Williams lost her match at Wimbledon this year, but luckily, she had her friends there to support her.
Golf legend, Tiger Woods, Racing driver Lewis Hamilton and fashion maven Anna Wintour were also in Williams' box for championship day.
Kerber ultimately took the title this time, but Williams certainly had the support of her millions-strong fanbase.
You know what's better than one well-dressed duchess having fun in the sun? Two.
But the champion sailed through her semi-final against Julia Görges from Germany, taking the match in straight sets on Thursday.
"This is not inevitable for me", Serena Williams said, alluding to the serious postpartum health problems she faced after giving birth.