Serena Williams crashed to a rapid defeat in the women's singles final at Wimbledon as her close friend the Duchess of Sussex watched on from the royal box.
The duchess, dressed in a shirt and high-waisted blue and white skirt, was seen applauding the tennis action on Centre Court on Saturday afternoon.
Meghan sat alongside her sister-in-law the Duchess of Cambridge, with the pair smiling and chatting with Kate's sister Pippa Matthews in their seats in the box's front row.
Wimbledon 2019 - Day Twelve - The All England Lawn Tennis and Croquet ClubThe Duchess of Cambridge and The Duchess of Sussex during the women's singles final on day twelve of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon.
After Williams crumbled to a straight sets defeat, both Kate and Meghan joined the crowd in a standing ovation for the new champion Simona Halep.
Kate was seen congratulating the Romanian on her win as she came off court, before Halep showed off her trophy from a Centre Court balcony to the crowd waiting outside.
Meeting the royal must have been a dream come true for the 27-year-old tennis star, who previously revealed she was a fan of the duchess.
Asked before Saturday's match which one person she would want watching in the royal box, she said: "Kate. I like her."
When BBC presenter Sue Barker informed the winning finalist on court she was about to meet Kate, Halep replied: "That's amazing, I didn't know that, so it's even more special now."
Williams and Meghan have grown close in recent years, with the 23-time grand slam champion attending the duchess's wedding in May last year.
This is the second time the duchess has watched the American superstar at the tournament in 2019, after making a low-key visit to catch Williams's second-round match.
Speaking to reporters after the final, Williams heaped praise on her friend Meghan.
She said: "Just having her in general as a friend is great. She's such a great friend and a great person as well.
"Always positive no matter what. It's so good to have people like that just to know. She's such a fan of the sport."
"She, too, was happy for Simona. She saw she played unbelievable. That's just the kind of person she is."
Both Meghan, who is currently on maternity leave, and Kate watched the Wimbledon women's final in 2018, which Serena also lost in straight sets.
It was the first official engagement Meghan and Kate had carried out together, without their partners.
Neither of the dukes of Cambridge and Sussex were seen at the final on Saturday and there was no sign of Harry and Meghan's new baby Archie.
The two duchesses arrived separately to SW19, with Kate first meeting some female junior players in her role as patron of the All England Lawn and Tennis Club.
For Williams, who is married to Alexis Ohanian, the co-founder of the Reddit website, Saturday's defeat is her third grand slam final loss since giving birth in September 2017.
During the tournament the tennis superstar spoke about how she has made sure she spent time with her daughter Olympia despite her busy playing schedule.
Olympia made a surprise appearance during her mother's quarter-final post-match conference earlier in the Championships.
The 22-month-old had to be distracted with a yellow butterfly book while her mother answered questions from reporters.
Last week, Swiss great Roger Federer revealed he had recently played tennis with Kate's son Prince George during a visit to her parents' home in Bucklebury, Berkshire.
Williams was later asked if she might be giving a few tennis pointers to baby Archie one day.
"I'm actually working on Olympia's game. Maybe she can give tips to him. She'll be his older sister," she said.
"We like to do a lot of sports with Olympia. Actually she likes soccer more, so we'll see."
Prime Minister Theresa May was among the famous faces watching the action with the duchesses from the royal box on Saturday.
Poldark star Aidan Turner, actress Lily James and Doctor Who's Jodie Whittaker were also spotted among the Wimbledon crowds.