LONDON — Prince Harry’s fiancée, Meghan Markle, appeared for the first time at an official event with Queen Elizabeth II on Monday, highlighting the royal family’s welcome of its newest member just two months before their wedding.

The two were joined by other members of the monarchy, including Markle’s soon-to-be brother- and sister in-law, Prince William and Catherine, Duchess of Cambridge, to celebrate Commonwealth Day at Westminster Abbey in London.

Wearing an off-white coat and hat, Markle, an American actress, was seated behind the queen and next to Princes Harry and Andrew. The couple walked in behind Prince William and Catherine, passing a troupe of dancers performing outside the abbey.

The queen is the head of the Commonwealth, a group of 53 nations around the world that are largely former British territories. Around 2,000 people were expected at the interfaith gathering, including Prime Minister Theresa May and British singer Liam Payne.

While this is Markle’s first time at an event together with the queen, she has had a busy few months since her engagement to Prince Harry in November. The former “Suits” star has had a preview of her future role…