Meghan Markle Sat behind Kate Middleton during Commonwealth Day Service at Westminster Abbey

The Duke and Duchess of Sussex were spotted sitting behind Prince Williams and his wife, Kate Middleton, at the Commonwealth Day Service, which was held on Monday.

In their final appearance as senior members of the royal family, Meghan and her husband, Harry, were pictured seated in the second row, behind the Duke and Duchess of Cambridge, the Queen, Prince Charles and the Duchess of Cornwall.

This seating order raised questions among viewers who wondered why Meghan and Harry were seated in the second row.

According to tradition, the more senior members of the royal family are to be seated closest to the altar. As observed, the royals took the same seats they did at the event last year.

Harry and Meghan's appearance at this event is their last announced engagement as royal members. The couple who left the UK for Canada last year returned recently for their final rounds of royal meetings.

They recently joined the Queen to attend a Sunday church service at The Royal Chapel of All Saints in Windsor, close to their home, Frogmore Cottage.

The Queen, who is the most senior member of the royals, became the head of commonwealth in 1952 when she was only 26. She is also the Patron of the Queen's Commonwealth Trust with Harry as President and Meghan as Vice President.

The theme of this year's commonwealth service was "A Connected Commonwealth," and it reflected how the Commonwealth is made up of 53 countries and about a third of the world's population.

The Duchess of Sussex stole the show in an emerald caped Emilia Wickstead sheath dress.

2,000 people attended the event, with some influential figures attending. These included Prime Minister Theresa May, the Rt Hon Patricia Scotland QC, alongside high commissioners.

Ambassadors, and dignitaries from all over the UK and the Commonwealth were also present, with faith leaders, and over 800 school children, among others.

The traditional annual service was televised on BBC One and had Anthony Joshua give a speech about being a member of the Commonwealth.

The service also had an exceptional performance from Grammy award-winning band, Clean Bandit, and Alfie Boe. There was also a performance by Alexander Burke.

While many fans wondered about what went down at the event, others couldn't help but talk about the fashion statements made by the royal ladies.

While the Queen arrived in a royal blue dress, Kate was dressed in a Catherine Walker ensemble with a hat.

Meghan, however, stole the show in an emerald caped Emilia Wickstead sheath dress and a matching green headpiece.