Queen Elizabeth II and Prince Philip Celebrate 70th Wedding Anniversary

The royal family gathered at Windsor Castle on Monday night to celebrate the platinum wedding anniversary of Queen Elizabeth II and Prince Philip.

The couple was surrounded by family and close friends as they marked their 70th year of marriage.

However, two important people were notably missing from the guest list: Prince Harry's girlfriend, Meghan Markle, and Princess Eugenie's boyfriend, Jack Brooksbank.

While Meghan is reportedly in London after wrapping up filming for her hit show “Suits” in mid-November, she did not receive an invitation to the historic event.

Instead, Prince Harry attended with his older brother, Prince William, and his sister-in-law, Kate Middleton.

This is most likely due to the no-ring, no-bring rule, which means that significant others who are not engaged to a member of the royal family are not allowed to attend family events.

The no-ring, no-bring rule has been in place for years, but there have been some notable exceptions.

In 2002, the Queen invited Prince Charles' now-wife, Camilla, to her post-Jubilee party.

Other guests in attendance at the 70th anniversary party included Mike and Zara Tindall, Princesses Beatrice and Eugenie, Princess Anne and Tim Lawrence, and the Duke and Duchess of Kent.

The Duchess of Cambridge, who is expecting her third child with Prince William, looked stunning in a black lace dress with a four-strand pearl choker borrowed from the Queen, while her husband looked smart in a black tuxedo.

The Queen and Prince Philip also celebrated their anniversary by releasing a series of new portraits taken by British photographer Matt Holyoak in early November.