Victoria Jones/PA WireKate Middleton attended day two of Wimbledon 2019 on Tuesday.
The Duchess of Cambridge arrived at London's All England Lawn Tennis and Croquet Club in a custom white shirt dress by luxury womenswear brand Suzannah. The royal cinched her ensemble with a black Alexander McQueen belt and pinned a bow brooch onto her lapel. She also accessorized her look with a pair of gold fern Catherine Zoraida earrings, an Alexander McQueen "Wicca" mini clutch in raffia, a pair of Ray-Ban sunglasses and some Gianvito Rossi black suede shoes.
The mother of three sat next to players Anne Keothavong and Katie Boulter in an outside court, where they watched Harriet Dart face off against Christian McHale. She then moved to the royal box in Centre Court, where she was joined by Wimbledon chairman Philip Brook.
While Kate's appearance came as a surprise to some attendees, royal admirers know she has an affinity for sports. In fact, she's attended The Championships before, including last year with her husband Prince William.
This wasn't the first time a famous face had been spotted amongst the crowd at this year's tennis tournament.
Rebel Wilson, Janelle Monae and Alex Rodriguez were all photographed enjoying a match yesterday. To see more celebrity sightings, check out the gallery below.
Kate Beckinsale
The actress appears at the Men's Singles Final wearing Dolce & Gabbana.
Brooklyn Beckham and Hana Cross
The son of David Beckham and Victoria Beckham attends the Men's Singles Final with his girlfriend.
Jeff Bezos and Lauren Sanchez
The Amazon CEO and his girlfriend attend the Men's Singles Final.
Kendall Jenner and Fai Khadra
The reality star and her friend attend the Men's Singles Final.
Tom Hiddleston, Benedict Cumberbatch and Sophie Hunter
The two actors appear with Benedict's wife to watch the Men's Singles Final between Roger Federer and Novak Djokovic.
Kate Middleton and Prince William
The Duke and Duchess of Cambridge attend the Men's Singles Final.
Pippa Middleton and Carole Middleton
The two watch the Men's Singles Final between Roger Federer and Novak Djokovic.
Kate Middleton, Meghan Markle and Pippa Middleton
The Duchess of Cambridge (in Dolce & Gabbana) and her sister appear with the Duchess of Sussex as they watch her BFF Serena Williams compete against Simona Halep in the Ladies' Singles Final.
Suki Waterhouse
Summer style is in full swing and the actress' casual look is proof.
Claire Foy
The Crown star gets animated while watching a particularly intense match.
David Beckham
How the tables have turned! The soccer player sits in the crowd as the athletes rally.
Woody Harrelson
The True Detective star dons a fedora and shorts for the high-profile games.
Pippa Middleton & James Matthews
Kate Middleton's sister and brother-in-law return to the courts for another day of intense matches.
Eric Bana & Rebecca Gleeson
The Dirty John actor and his wife enjoy a low-key day at Wimbledon.
Jude Law & Phillipa
On the heels of their honeymoon, the newlyweds enjoy a fun and exciting game.
Ellie Goulding
Despite having her hands full, the British pop star looks effortlessly elegant in the stands.
Poppy Delevingne
The Brit rocks a sleeveless Polo Ralph Lauren dress.
Charli XCX
The "1999" singer can't get enough of all the excitement on the court.
Maisie Williams
Whether it's a full suit of armor or a head to toe pink getup, the Game of Thrones actress proves she looks radiant in just about anything.
Tessa Thompson
The Men in Black: International star stuns at the All England Lawn Tennis and Croquet Club.
Pippa Middleton and James Middleton
Kate Middleton's stylish siblings stroll through the All England Club. Pippa chose a pink, Stella McCartney dress for the day.
Nicole Richie and Joel Madden
The Simple Life alum went for a bright floral sun dress while her husband rocks dark camo.
Sienna Miller
The actress looks cool and confident in her monochromatic look for day seven of Wimbledon.
Felicity Jones and Charles Guard
Rogue One's superstar and her husband sport matching sunglasses.
Meghan Markle
The Duchess of Sussex enjoys a girls' day out as she cheers on close friend and tennis champ Serena Williams.
Phoebe Waller-Bridge
The Fleabag star is on the edge of her seat during a match.
Geri Horner
The Spice Girls songstress can't hide her excitement from the stands.
Nathaniel Irvin & Janelle Monáe
Wimbledon ready! Monáe looks ready for the court in a preppy, chic ensemble. She also posed for a picture with her music collaborator Nathaniel Irvin.
Carole Middleton
Kate Middleton's mom looks prim and proper as she arrived.
Sam Claflin
The Hunger Games star is dressed to the nines for day three of the sporting event.
Considering the tournament is just getting started, fans can expect even more celebrity sightings.