Meghan Markle joins Prince Harry for polo on Princess Diana's birthday

Meghan Markle and Prince Harry returned to the Audi Polo Challenge on what would have been the 57th birthday of Princess Diana

The Duke and Duchess of Susbad arrived together at the event annual charity.

Meghan, 36 years old She opted for a casual white blouse and a pair of fitted black dungarees, which she accessorized with a pair of black flats, sunglbades and what appears to be the even Madewell x Biltmore panama that she wore to the event Saturday.

Meanwhile, Harry was seen arriving in a white polo shirt with stripes on the side, which he paired with white pants and boots.

RELATED: Surprise! Meghan Markle joins Serena Williams to cheer for Prince Harry at the Polo game

Meghan also attended the event Saturday, while she encouraged Harry and his brother Prince William while the brothers Royal went to the field at the Coworth Park Polo Club. William was not seen arriving at the event on Sunday.

The Audi Polo Challenge probably holds a special place in the hearts of Meghan and Harry: Their appearance at the game last year was the first time the couple had attended a public event together, and they marked the milestone with a kiss.

• You can not get enough of the PEOPLE Royals cover? Sign up for our newsletter to get the latest updates on Kate Middleton, Meghan Markle and more!

Prince Harry

Mark Cuthbert / British Press via Getty Images

Also present was actor Eddie Redmayne, who attended Eton College in the early 2000s with William. In addition to playing in the same rugby team, they were also honored as members of the elite elite group responsible for exercising discipline at school.

RELATED: Royal Baby Album! The best photos of Princess Diana with young William and Harry

In a gentle wink to Diana, Meghan and Harry found many ways to honor his legacy at their wedding in May .

Diana's favorite flowers: Forget-Me-Nots.

The Duke and Duchess also included another of Diana's favorite flowers – white garden roses – in a unique floral show. In the St. George's Chapel

VIDEO: How Prince Harry and Meghan Markle subtly honored Princess Diana in their wedding photos

Later in the day, Meghan wore the Acoustic Ring. Diana's navy on her right hand. she and her husband were seen leaving for their wedding reception.

Diana wore the emerald cut Aquamarine Stunner at an auction of her own clothes at Christie's in 1997.

Meghan Markle and Princess Diana [19659011] Steve Parsons – WPA Pool / Getty Images; Tim Graham / Getty Images

RELATED: In honor of the birthday of Princess Diana, we look back at some of her most memorable moments of style

In a last glance at Harry's mother, couple included a special detail in one of their wedding photos!

In an image released by the palace, while Meghan sits on the floor of Windsor Castle's green living room, Harry sits on an emerald green couch. This was the same sofa on which Harry's mother was photographed sitting holding a baby Harry at his baptism in 1984.

Prince Harry, Meghan Markle and their pages and their bridesmaids pose in the green living room of Windsor Castle

Alexi Lubomirski / AP / REX / Shutterstock

Diana was sitting next to Queen Elizabeth while Prince Charles was resting on the arm of the old furniture next to her. In the middle of the photo was a young William dressed in a white polo shirt and a baby blue shorts while he was smiling off camera.