Sienna Miller embraced flower power in an Alessandra Rich dress for The Championships, Wimbledon on Tuesday in London. The actress and model wore a minidress from the eponymous designer, featuring a bevy of feminine elements throughout the look.

Miller’s minidress featured a drop waist silhouette with ruffle detailing at the hips. On the bodice of the dress, the piece included even more ruffle details at the neckline along with puff sleeves that cinched at the end. The neckline included a black string of fabric tied into a delicate bow. All over the cream fabric of the dress, purple and orange rosettes featured throughout.

Miller accessorized her look with brown sunglasses and opted to go minimal with her jewelry.

The “Horizon: An American Saga” actress was joined by her partner Oli Green. Green styled a suited look for the Grand Slam tennis tournament, wearing shades of navy, light blue and a gray tie for his attire.

Morgan Riddle was also seen wearing a design by Alessandra Rich earlier in the tournament. On July 3, Riddle was seen wearing a coordinated set, featuring a navy blue base fabric and white polka dots, merging a classic pattern with a streamlined silhouette.

Both Riddle’s and Miller’s Alessandra Rich looks catered to Wimbledon’s more formal dress code. The Grand Slam tennis tournament, which is nearly 150 years old, requires players to wear all-white tennis kits on court, while spectators are encouraged to dress in business attire, forgoing street style for pieces that are more polished.

Several spectators at the 2025 edition of Wimbledon took the tennis whites dress code a step further by styling monochrome attire in cream and crisp white. Monica Barbaro, Andrew Garfield, Maude Apatow, Priyanka Chopra Jonas and more styled all-white ensembles thus far.