Kate Middleton has been missing from the public spotlight for months, but she is still the most famous member of the British royal family, according to a royal expert.

The Princess of Wales announced in March that she was diagnosed with cancer following her abdominal surgery in January. She has not carried out any royal duties this year amid her health battle. Despite this, she still topped the recent most popular royal poll, prompting Arthur Edwards, The Sun's royal photographer, to dub her the "biggest star" in the royal fold.

"She's just a huge star in the royal family. I mean, it's no secret that she is the biggest star of them all," Edwards told Matt Wilkinson when he joined him on The Sun's "Royal Exclusive Show."

Prince William, Prince of Wales and Catherine, Princess of Wales, Kate Middleton
Prince William, Prince of Wales and Catherine, Princess of Wales visit the Indian Streatery, an authentic, family run independent Indian restaurant based in the city centre during their visit to Birmingham on April 20, 2023 in Birmingham, England. Arthur Edwards - WPA Pool/Getty Images

The veteran photographer also showered Middleton with praise for being a mom, working royal and photographer. Edwards even called Prince William's wife "incredible."

"I think she's just an incredible woman in my view," Edwards continued. "She is not only a mother and rearing three beautiful children, she's a great member of the royal family. She's a hardworking member of the royal family. She's a great photographer, I have to say that, I must say her pictures get better and better and she shares them with us all."

Edwards was not alone in his opinion about Middleton's popularity within the British monarchy. In a YouGov poll in April, Middleton topped the survey despite her long absence from her royal duties.

Prince William, Prince of Wales, and Catherine, Princess of Wales, Kate Middleton
Britain's Prince William, Prince of Wales (L) and Britain's Catherine, Princess of Wales attend a pre-campaign launch event, hosted by The Royal Foundation Centre for Early Childhood, at BAFTA on January 30, 2023 in London, England. Eddie Mulholland - WPA Pool/Getty Images

The Duchess of Cambridge hasn't been seen in any royal engagement since January. However, her favorability score was the highest. She scored 76, three points higher than her husband, Prince William.

Phil Dampier, a seasoned British journalist who has been writing about the royal family for over 30 years, also agreed that Middleton is the most popular British royal, calling her the "box office star."

Prince William and Kate Middleton
Prince William, Prince of Wales and Catherine, Princess of Wales visit the Open Door Charity, a charity focused on supporting young adults across Merseyside with their mental health, using culture and creativity as the catalyst for change, at the charity’s flagship Bloom Building on January 12, 2023 in Birkenhead, England. Jon Super-WPA Pool/Getty Images

"There's no doubt that the Princess of Wales is the box office star of the royal family, and they are missing her terribly," Dampier said.

"We all hope she recovers from her cancer soon and is back in action for the summer. When we see her out and about again a lot of the current air of uncertainty about the royal family will disappear."

Meanwhile, Rebecca English, Daily Mail's royal editor, recently claimed that Middleton "has been seen out and about more with her family in recent weeks." However, several netizens were not convinced because there were no photos to support the claim.

Prince William and Kate Middleton's Family
Britain's Prince William, Prince of Wales, Britain's Catherine, Princess of Wales, Britain's Princess Charlotte of Wales and Britain's Prince Louis of Wales wave to the crowds from the Buckingham Palace balcony as they wait for the Royal Air Force fly-past in central London on May 6, 2023, after the coronations of King Charles III and Queen Camilla. LEON NEAL/POOL/AFP via Getty Images
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Kate Middleton, Royal family, Princess of Wales