Meghan Markle had a very relatable makeup slip up during Field of Remembrance debut

The Duchess of Sussex made her Field of Remembrance debut on Thursday, joining Prince Harry for a ceremony to honor Britain's fallen soldiers and plant their Cross of Remembrances in front of Westminster Abbey.

While Prince Harry, dressed in his traditional military garb, had been six times before, it was Duchess Meghan's first time at the annual event, which has been held for the past 91 years ahead of Remembrance Sunday. Duchess Camilla was also scheduled to join the couple at the commemorations, but had to cancel last minute due to an illness.

Thursday's commemorations also included a royal walkabout with veterans and military families -- and it was a day that one veteran (and royal fan!) will surely never forget.

D-Day veteran William Allen had the opportunity to meet Meghan, who sat alongside the 99-year-old and heard more about his time in the war. While hugging goodbye to Allen, however, Meghan was met with a very relatable makeup mishap -- her face powder had smudged onto Allen's military jacket!

Daily Mail reporter Rebecca English shared a photo of Allen, proudly showing off the royal smudge on his right shoulder. "I’m never washing that!" the veteran joked. Meghan, 38, also met with Brenda Rendell at the event, whose late husband helped build the famed Royal Yacht Britannia.

The duke and duchess are expected to step out again alongside the royal family on both Saturday and Sunday for more Remembrance Day commemorations, including for Saturday's annual Royal British Legion Festival of Remembrance at the Royal Albert Hall and Sunday's Remembrance Day Service at the Cenotaph.

The Duke and Duchess of Cambridge also paid tribute to this weekend's events on an outing on Thursday, where they helped kick off one of their new charities called National Emergencies Trust (NET), which will bring together charities across the United Kingdom to distribute funds and resources in wake of domestic disasters.

The parents-of-three dutifully sported their navy outfits and Remembrance poppy brooches to meet with victims of the Westminster Bridge attack and the Grenfell Fire. The poppies have been a symbol of remembrance in Britain since 1921 to honor fallen servicemen and women. It's believed to have come from John McCrae's poem about World War I, “In Flanders Fields." The opening line of the poignant poem reads:

In Flanders fields the poppies blow
Between the crosses, row on row
That mark our place; and in the sky
The larks, still bravely singing, fly
Scarce heard amid the guns below.

This might be the last time we catch the Sussexes until the holiday season. It was announced last month that beginning in mid-November, Meghan and Harry will take a much-needed six-week break from royal duties and travel to Los Angeles to spend baby Archie's first Thanksgiving with Meghan's mom, Doria. The couple will then return to England to spend Christmas with Queen Elizabeth and the rest of the royal family at her majesty's Sandringham estate.

For more on Thursday's outing, watch the video above.