Meghan Markle's Half-Sister Samantha Compares Her to Cruella de Vil

The Duchess of Sussex was waving to well-wishers, who later sang her Happy Birthday, when she accidentally flashed her bra. Her engagement outfit - a frothy, transparent Ralph & Russo gown fit for the red carpet was an estimated £58,000.

On her 37th birthday, Meghan Markle graciously put her own festivities on hold to celebrate Prince Harry's childhood friend Charlie van Straubenzee and his now-wife, Daisy Jenks, at their wedding on Saturday.

Prince Harry served as best man for Straubenzee's wedding today, which explains the cards he's holding while he and Meghan walk together to the ceremony.

Happy Birthday to HRH The Duchess of Sussex! followed by a HappyBirthdayHRH hashtag.

Van Straubenzee, 30, was one of Prince Harry's ushers during his wedding in Windsor three months ago.

Meghan wore a navy blouse with a colorful green, blue, pink, and purple skirt to the event, an ensemble she paired with a Philip Treacy fascinator and Aquazzura shoes.

Daisy accompanied her husband to the Royal Wedding and was seated close to the bride and groom in St George's Chapel.

Prince Harry and Meghan, who have been spending their spare time at their country home in the Cotswolds, will be joining Queen Elizabeth shortly at Balmoral for the annual royal family summer visit to the Scottish Highlands.

But one of the biggest surprises of the day was the absence of the Duke and Duchess of Cambridge, who were widely tipped to attend.

The image shows the Queen smiling ear to ear with Meghan at their first solo outing together.

Next spring, Meghan and Harry are scheduled to make their first tour to the United States at the request of the U.K. Foreign Office and the British government.

As always, Meghan appeared poised with not one hair out of place.

Meghan pointed to the product range and said, "I'm sure at some point we'll need the whole [lot]".