She looked regal in a pleated navy shirt dress that she paired with a stand-out Philip Treacy fascinator and Aquazzura pumps.
Meghan Markle showed off her gorgeous birthday suit-at a friend's wedding. Since marrying Prince Harry, Meghan has stunned in so many incredible outfits. Just as the new Duchess is celebrating her 37th birthday, her relative decides to compare her to Cruella de Vil, the doggie hating villain from Disney's 101 Dalmatians.
The guests also included Princess Eugenie and fiance Jack Brooksbank, who are getting married themselves on October 12.
"Thank you everyone for your lovely messages on The Duchess of Sussex's birthday", Kensington Palace added.
Meghan and Prince Harry were later spotted holding hands at the wedding of Charlie van Straubenzee and Daisy Jenks. According to PEOPLE, he has been friends with Harry since they met at Ludgrove Prep School.
Van Straubenzee, 30, was one of Prince Harry's ushers during his wedding in Windsor three months ago.
The Duke and Duchess of Cambridge were also rumoured to be invited to the couple's big day as William is good friends with the van Straubenzee brothers, with Thomas a godfather to his daughter Princess Charlotte.
"She did want to be famous, she's got everything that she wanted, but I also think "be careful what you wish for" because sometimes it's not all that it seems".