Meghan Markle, Prince Harry reunite with Kate and William for Commonwealth Day ceremony

The Fab Four is together again!

On Monday, Meghan Markle and Prince Harry reunited with Prince William and Kate Middleton at Westminster Abbey to attend the Commonwealth Service, which celebrates the relationship between the United Kingdom and 54 other states.

The interfaith service on March 9, which was also joined by Prince Charles, the Duchess of Cornwall and Queen Elizabeth, marked the Duke and Duchess of Sussex's last engagement before they officially step back from their roles as senior royals on March 31. Unlike in past ceremonies, the Cambridges and the Sussexes did not take part in Her Majesty's procession but were rather ushered directly to their seats.

Meghan opted for green Emilia Wickstead, while Kate donned red Catherine Walker.

In January, Meghan and Harry announced that they planned to become independent from the monarchy and move to Canada with their now 10-month-old son Archie. A follow-up press release from the couple's team clarified that they were allowed to retain their royal titles, but lose their His/Her Royal Highness prefixes and would not be allowed to use any iteration of "Royal," including the name "Sussex Royal." Their Buckingham Palace office would be shuttered and Canada will not fund the family's security when the couple officially transitions later this month.

The duke arrived in the UK to kick off his final engagements during the last week of February, including teaming up with Bon Jovi for the upcoming Invictus Games. Meghan arrived in London last week to close out her duties, which involved private meetings with her patronages, a surprise visit to an upper school for International Women's Day, and to join Harry at the Endeavour Fund Awards and the Mountbatten Musical Festival.