"Happy Birthday to HRH The Duchess of Sussex" the picture was captioned. Prince Harry wore a baseball cap, while Meghan was sat in the middle seat. The royals typically take time off in August, and return to a regular schedule of engagements in September.
Meghan arrived separately, in a short-sleeved Club Monaco dress with blue top and multicolored skirt with a Philip Treacy hat. He has recently complained in the press about how Meghan and Kensington Palace have recently severed ties with him and has also expressed concern over her public royal appearances.
Princess Eugenie, the daughter of Prince Andrew and Sarah Ferguson, and her finance Jack Brooksbank, who are also due to marry at Windsor Castle this October, also attended the wedding festivities.
The Duchess of Sussex isn't afraid to invest in the best - her royal wardrobe is reported to have already cost $1m.
Van Straubenzee also attended Harry and Markle's wedding.
Samantha later admitted to having set up the photos saying she has no problem "cashing in" on her royal sister, telling Good Morning Britain, "We all have to survive, money makes the world goes around - if you want to call that cashing in". Meghan and Harry started talking about their next big milestone - children - in the months leading up to their wedding.
"I worked in media most of my life and in broadcasting, so because my sister is suddenly royal isn't grounds for me to stop doing all of that", Samantha said.
However, the Duchess is thought to have a number of affectionate terms for her husband.
The royal couple, holding hands, left together shortly after the hour-long ceremony ended and sped off before the newlyweds were showered with confetti.