It's good to be a duchess!
English Rose Kate and American actress Meghan made it clear they have formed a special trans-Atlantic relationship of their own since the royal wedding.
Before the match begins, the Duchess of Cambridge and the Duchess of Sussex will meet with former female tennis champions.
But before they could take their seats, the pair met with ball boys and girls, wheelchair competitors and junior players ahead of the day's play.
The men's singles semi-final between Rafael Nadal and Novak Djokovic will resume at 1pm tomorrow on Centre Court under the roof.
Many fans were quick to comment on Twitter how the 36 year old looked identical to the line judge.
Williams, who gave birth 10 months ago, is the first mother to reach the last round of the tournament since Australian Evonne Goolagong in 1980.
Janine Puhak is an editor for Fox News Lifestyle.
She was wearing wide-legged cream pants with a blue and white Ralph Lauren shirt in a nod to the designer who supplies clothing for the championship's ball boys and girls.
Serena had initially been coy about whether Meghan would be attending the game, but when press confirmed she would be there, she added with a smile: 'There you go.
This year F1 ace Lewis Hamilton, golfer Tiger Woods and Dame Anna Wintour offered their support from behind her team. "If I keep winning", she told E! We always have supported each other, just been there for each other through a lot. The mother-to-be also wore a dress to the event like her sister Kate instead of opting for trousers like Meghan Markle and Emma Watson.
Kerber eventually won in two sets and took home the title.
How does Meghan Markle know Serena Williams?
Williams spoke about her friendship with Markle in a post-match press conference.