Royal sisters-in-law Kate Middleton and Meghan Markle will make their long-awaited first appearance together on Saturday to watch the ladies’ singles final at Wimbledon from the royal box.

Sports fans’ eyes will be on the centre court action between former champion Serena Williams and 11th seed Angelique Kerber. But royal watchers will likely be more focused on the two glamorous duchesses, out for the first time together without their husbands.

It will also be the first time Meghan, the new Duchess of Sussex, has enjoyed Wimbledon from the royal box.

She has been to the All-England Club to watch her friend Williams play before, but that was from more humble seats and with a look that was much more amateur than her streamlined duchess couture. Thank you, linesmen. Thank you, stylist.

Meghan with her early version of the royal leg cross at Wimbledon in 2016, the year she met Harry. Photo: Getty

In 2016, the year she met Harry, the then-Suits star cheered from the cheap(er) seats in outfits including a black wrap dress and white jeans with matching shirt and fedora – and declasse wristband instead of a posh lanyard. You know what, she might wear the same hat, but unlike two years ago, her hairdo will be as bouncy as new balls.

Winning look or lacking polish? Meghan courting attention in 2016. Photo: Getty

The actress and now-mother of one met in 2014 when they played a game of flag football at a celebrity beach event, and “hit it off immediately,” Meghan wrote on her now-defunct lifestyle blog.

“We were chatting not about tennis or acting but about all the good old-fashioned girly stuff. So began our friendship.”

Kate’s relationship with Wimbledon is both professional and personal. As a girl, she queued with her family for tickets and now is patron of the All-England Club after the Queen handed her the baton last year.

The Duchess of Cambridge has missed Wimbledon only once since her 2011 marriage to Prince William – in 2013 on doctor’s orders, while pregnant with Prince George.

Kate brushes something – strawberries and cream? – from William’s face in 2017. Photo: Getty

As a newylwed seven years ago, Kate even got into the swing of things with a Mexican wave with former champ Billie Jean King.

Kate makes Wimbledon into an interactive experience. Photo: Getty

Before Saturday’s match, Kate and Meghan will meet former Wimbledon women’s champions, as well as ball boys and girls.

The centre court action kicks off at 2pm (11pm AEST). The Duchess of Cambridge will return to the All-England Club with her husband, Prince William, to watch the men’s final on Sunday.

The royals are far from the only celebrities who have enjoyed the action at Wimbledon in recent days.

US Vogue editor-in-chief Anna Wintour – a Brit by birth – is a regular at Wimbledon, and drifted onto centre court on July 13 in a printed, pleated silk tea dress.

Dame Anna Wintour went the dress up, not down, route. Photo: Getty

Jessica Biel and Justin Timberlake were animated supporters on July 10, with the actress in a printed maxi and cat-eye sunglasses, and her singer husband in suit and t-shirt.

Go team: Jessica Biel and Justin Timberlake have a verbal rally. Photo: Getty

Acting husband and wife duo Damian Lewis (Homeland) and Helen McCrory (Harry Potter) were style winners.

Helen McCrory and Damian Lewis show amateurs how to do Wimbledon. Photo: Getty

Five-time champ Bjorn Borg still knew how to turn heads on centre court, wearing a startling tan with his navy suit.

Bjorn Borg (right) or George Hamilton? Photo: Getty

The Duchess of Cambridge’s sister Pippa Middleton, a Wimbledon regular, was back for the second week in a shirt dress that showcased her baby bump.

Pippa is still playing tennis in her second trimester. Photo: Getty

The Countess of Wessex wore her heart and some black detailing on her sleeve on July 11.

Sophie rode the bumps with the rest of the crowd. Photo: Getty

TV adventurer Bear Grylls had a tamer time at Wimbledon with his wife Shara. No Swiss Army knife or parachute required.

Bear and Shara Grylls avoid style danger in matchy-match blue. Photo: Getty

Actor Stanley Tucci and his wife Felicity Blunt caught up on some reading next to Cliff Richard, who was dressed as a minor screen gangster in clashing black pinstripes. That’s a double fault right there.

Avid readers Stanley Tucci, Felicity Blunt and Cliff Richard. Photo: Getty

Actress Olivia Munn looked like she had borrowed John Farnham’s 1980s ‘Whispering Jack’ coat and teamed it with ugly mushroom shorts and a top fit for the nightclub.

Olivia Munn’s sunglasses were the best part of her look. Photo: Getty