Prince Harry and Meghan to reunite with Prince William and Kate for an important cause

By Jessica Pollack

Prince Harry and Meghan have just returned from their 16-day tour of Australia, New Zealand, Fiji and Tonga, and after completing a mind-boggling 76 engagements in the four Commonwealth countries they're due for a rest. But after some well-earned downtime, HELLO! has learned that the parents-to-be will reunite with the other half of the 'fab four,' Prince William and Kate, for an important cause - the Festival of Remembrance on the evening of Nov. 10. The couple will be making their debut at the annual service at the Royal Albert Hall in London.

Kate has attended the event for the past three years. Photo: © Getty Images

Members of the Royal Family are regulars at the event, where Prince William and Kate, both 36, have been the guests of honour for the past three years. The mother of three always turns up in an elegant black ensemble with a poppy on her lapel. This year, the Sussexes will join the Cambridges in the royal box as well as the Queen, Prince Charles and Camilla (who will have just returned from their tour in Africa), Prince Andrew, Prince Edward and the Countess of Wessex, Princess Anne and Sir Timothy Laurence, the Duke and Duchess of Gloucester, the Duke of Kent and Prince and Princess Michael of Kent.

This year's service commemorating soldiers who have lost their lives at battle is particularly meaningful as it's the 100th anniversary of the First World War, and will be hosted by BBC presenter Huw Edwards. The following day, Prince Harry and Meghan will attend the annual Remembrance Day Service at The Cenotaph, where the pregnant royal is likely to watch from the balcony of the Foreign & Commonwealth Office building alongside the Queen, the Duchess of Cambridge and other female royals. And that evening the 'fab four' will head to Westminster Abbey, where Prince William and Kate said "I do," for a service to mark the Centenary of the Armistice.

The Cambridges and the Sussexes were last seen together at Princess Eugenie's wedding. Photo: © Getty Images

The foursome was last seen at Princess Eugenie and Jack Brooksbank's royal wedding on Oct. 12, right before the Sussexes headed out on tour. The royals sat together in the pews and were spotted chatting before the service began. But they haven't joined forces in an official capacity since the RAF Centenary celebrations in July, where the 'fab four' attended a service at Westminster Abbey before watching a flypast on the Buckingham Palace Balcony with the rest of their family.

RELATED: All the best moments from Prince Harry and Meghan's royal tour

Prince Harry is also due to visit the Field of Remembrance at Westminster Abbey on Nov. 8, as revealed by Kensington Palace. The palace tweeted that, "This will be the 90th year of the Field of Remembrance, which is organised by @PoppyFactory, and the 6th time that HRH has attended the event." Perhaps Meghan will make a surprise appearance there, too, to pay her respects and see the poppy-laden crosses that have so long been a tradition.

Don't miss a beat with HELLO! Canada's Daily Hits newsletter, your daily dose of royal and celebrity news, fashion, weddings and more. CLICK HERE to sign up for free!