Kate Middleton has been visible in public lately, which makes fans think if her maternity leave is over.

According to Francesca Specter, a journalist for Daily Express, many believe that the mom of three will return to her royal duties soon. Middleton reunited with Prince William, Meghan Markle, Prince Harry and the rest of the senior royals at the Royal Air Force centenary celebration. Many took her appearance at the said event as a sign that she's no longer on maternity leave.

Initially, Middleton was not expected to be at the event. Emily Nash, a royal correspondent for Hello! announced the event as the next big royal outing. She also mentioned the names of those who will be joining the Queen for the celebration and didn't include Middleton's.

"BIG royal outing: The Queen, Prince Charles, Camilla, William, Harry, Meghan, Andrew, Edward, Sophie and Edward will attend a service at Westminster Abbey to mark the centenary of the Royal Air Force on July 10, ahead of #HarryandMeghan's visit to Dublin," Nash wrote on Twitter.

According to Caitlyn Hitt, Middleton "felt the celebration was important to be at if she was feeling up to it," so she breaks her maternity leave. At the event, the Duchess of Cambridge was photographed smiling as she watched Camilla Parker Bowles struggle to button Prince Charles gloves.

Following the RAF celebration, Middleton stepped out again and watched Wimbledon with her sister-in-law, Markle, on Saturday. The two ladies watched the women's finals where the Duchess of Sussex's dear friend, Serena Williams, lost to Angelique Kerber.

"It was such an amazing tournament for me. I was really hoping to get this far," Williams said following her Wimbledon loss which moved the two duchesses. "It's obviously disappointing, but I can't be disappointed. I have so much to look forward to. I'm literally just getting started. To all the moms out there, I was playing for you today and I tried."

On Sunday, Middleton returned to the same event with her husband, Prince William. The Duke and Duchess of Cambridge watched the men's finals where Serbia's Novac Djokovic defeated South Africa's Kevin Anderson for the Grand Slam title. The couple was seen chatting and laughing while sitting at the royal box at Wimbledon's Centre Court.

Kate Middleton
Is Kate Middleton's maternity leave over? Pictured: Middleton attend the Men's Singles final on day thirteen of the Wimbledon Lawn Tennis Championships at All England Lawn Tennis and Croquet Club on July 15, 2018 in London. Getty Images/Clive Brunskill