Kate Middleton didn’t join Prince William on his four-day tour of Oman and Kuwait due to her children. But this doesn’t mean that the Duchess of Cambridge would have a short break from her royal duties

Buckingham Palace announced that Middleton will be attending a key royal engagement with Queen Elizabeth while her husband is overseas. Her Majesty will also be joined by Prince Charles, Camilla Parker Bowles, Princess Anne, and Prince Edward.

“Her Majesty The Queen, accompanied by other members of the Royal Family, will host a reception for NATO leaders, spouses, and their partners. The Queen, The Prince of Wales and The Duchess of Cornwall will formally receive the NATO leaders and their partners. This will be followed by a group photograph of Her Majesty and His Royal Highness with the Heads of State and Government,” the statement read.

The event will be held at the Buckingham Palace State Rooms. According to Express, the Duchess of Cambridge’s attendance at the event is one of the key signs that she is already preparing for her future role as Queen.

In September, People reported that Middleton has taken a few steps to cement her future role as Queen once Prince William ascends the throne. Royal insiders told the publication that the Duchess of Cambridge has really come into her own after the birth of her three children.

“The Duchess wouldn’t just join us; she would stay for the whole meeting. She has a deep curiosity to really understand the issues,” Kate Stanley, director of the strategy at the National Society for the Prevention of Cruelty to Children,” a source said.

Another source revealed that Middleton has also become more open with what she wants to say, and she also writes her own speeches at times.

Meanwhile, Prince William and Middleton are expected to reunite with the Queen and the other members of the royal family during this year’s Christmas celebration in Sandringham.

Kate Middleton Kate Middleton visits The Foundling Museum on March 19, 2019 in London. Photo: Getty Images/Eddie Mulholland