Before Meghan and Kate there were royal sisters-in-law Princess Diana and Sarah, Duchess of York

Meghan Markle and her new sister-in-law Kate couldn’t contain their excitement in the royal box at Wimbledon, where the pair enjoyed their first outing sans husbands. Dressed to the nines, the duchesses were giggling and chatting throughout the afternoon before both looking moved as Meghan’s close friend Serena Williams lost the title and dedicated her game to ‘all the moms.’
Fans couldn’t help but remember another famous set of sisters-in-law: Princess Diana and Sarah Ferguson. The equally stylish duo used to gallivant around together at official royal events, but also courtside at Wimbledon and in the stands at more casual polo matches. The friendship between Prince Charles’ late wife and Prince Andrew’s ex was a hot topic in the ’80s and ’90s and, much like Meghan and Kate, royal watchers were keen to know just how authentic their friendship was.
While they’ll never know for sure, the Duchess of Sussex and the Duchess of Cambridge were giving off major ‘Diana and Fergie’ vibes on their big day out. Click through to see the photos…

Wimbledon is an event not to be missed, and you better believe Diana and Sarah were there together in 1989! The two chatted in the stands while watching the matches.
Photo: © Adam Butler/PA Images via Getty Images

And just like Sarah and Diana, the Duchesses of Cambridge and Sussex made their very own courtside debut in 2018. The gorgeous royals were seen chatting and applauding for the players.
Photo: © Karwai Tang/WireImage

The royal friends also attended the tennis championship in 1988, where Diana wore a relaxed cream suit while the Duchess of York opted for a polka-dot blouse (with a side of gab).
Photo: © Derek Hudson/Getty Images

Despite Serena Williams' loss, Kate and Meghan had the best of times. Of particular note were their beautiful outfits, with the Duchess of Sussex looking cool in a nautical-themed Ralph Lauren ensemble while Kate stunned in polka dot Jenny Packham.
Photo: © Karwai Tang/WireImage

Princess Diana and Sarah wore equally striking outfits for Christmas at Sandringham on Dec. 25, 1988.
Photo: © Tim Graham/Getty Images

Meghan and Kate had a friendly chat as they walked at Sandringham for their very first Christmas together in 2017 after the former actress and Prince Harry announced their engagement.
Photo: © Joe Giddens/PA Images via Getty Images

While the 36-year-old duchesses didn't share a kiss on the cheek, royal fans have this vintage photo of a sweet moment between Sarah and Diana to look back on.
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The Princess of Wales and the Duchess of York were dressed to impress on the balcony of Buckingham Palace during the Trooping the Colour ceremony in June 1991. The princess donned a Catherine Walker suit and Philip Somerville hat.
Photo © Jayne Fincher/Princess Diana Archive/Getty Images

Another first for Meghan was that very event in 2018, when the two duchesses - each clad in a beautiful pastel ensemble - shared a friendly moment on the Buckingham Palace balcony during the flypast.
Photo: © Max Mumby/Indigo/Getty Images

The Duchess of York and the Princess of Wales had a ball in the stands at the Guard's Polo Club in Windsor in June of 1983. Fergie wore a blue floral-printed dress with oversized sunnies while Diana stayed snug with a sheep-printed sweater from the London shop Warm And Wonderful.
Photo © Jayne Fincher/Princess Diana Archive/Getty Images

The Royal Ascot in 1991 was all about bigs hats and bigger friendships! Sarah and Diana were thick as thieves at the annual event, even down to their coordinated outfits.
Photo: © Anwar Hussein/WireImage

Sarah and Diana rocked wide-brimmed hats while at the Epsom Downs together.
Photo: © Ken Goff/The LIFE Images Collection/Getty Images

Though their senses of style were different, royal watchers were always eager to see what the dynamic duo would wear when stepping out together.
Photo: © PA Images via Getty Images

Similarly, fans of Duchesses Meghan and Kate are always patiently waiting to see how their looks can be compared. While at the first-ever Royal Foundation Forum in February 2018, the royal women stuck with blue hues but styled their looks very differently.
Photo: © Chris Jackson - WPA Pool/Getty Images