Kate Middleton hasn't been seen in public since last year. Now, social-media users are suspicious.

Kate joined the royal family for their annual walk from Sandringham in Norfolk, England, to attend a church service on Christmas Day.

The Princess of Wales walked with her children and husband to the Church of St. Mary Magdalene in one of her signature coatdresses, much like she did in years past.

Kensington Palace said in its statement that Kate would remain in the hospital, The London Clinic, for up to two weeks following the procedure.

"Her Royal Highness The Princess of Wales was admitted to hospital yesterday for planned abdominal surgery," the statement read. "The surgery was successful, and it is expected that she will remain in hospital for ten to fourteen days, before returning home to continue her recovery. Based on the current medical advice, she is unlikely to return to public duties until after Easter."

Kensington Palace provided no additional information about what procedure Kate underwent, though the palace told the Associated Press the princess didn't have cancer.

The statement also said Kate hoped "her personal medical information remains private" to help provide her children with "normality."

"Kensington Palace will, therefore, only provide updates on Her Royal Highness' progress when there is significant new information to share," the statement went on to say.

Prince William was photographed visiting Kate at the hospital the following day.

"The Princess of Wales has returned home to Windsor to continue her recovery from surgery," the statement shared on Instagram said. "She is making good progress."

William and Kate went on to thank the staff at The London Clinic in the statement, as well as those who sent them well wishes.

The same day, Buckingham Palace announced King Charles was returning home after having a procedure for a benign prostate enlargement.

Buckingham Palace said in a statement that "a separate issue of concern was noted" during the king's prostate procedure, and additional testing disclosed he has cancer. The palace didn't disclose what form of cancer he was diagnosed with, though they said it wasn't prostate cancer.

The statement also said that the king "commenced a schedule of regular treatments" and that although he would still be working from home, he would "postpone public-facing duties" per medical advice.

The palace didn't specify how long the king would forgo public-facing work.

"His Majesty has chosen to share his diagnosis to prevent speculation and in the hope it may assist public understanding for all those around the world who are affected by cancer," the statement also said.

William paused his royal engagements amid Kate's surgery and recovery, returning to work on February 7 for an investiture ceremony at Windsor Castle.

The same day, he attended a gala raising money for the London Air Ambulance, and he thanked the public for their messages of support for Kate, Town & Country reported.

"I'd like to take this opportunity to say thank you, also, for the kind messages of support for Catherine and for my father, especially in recent days," he said, adding that "it means a great deal to us all."

He has attended a handful of public events since. The public was predicted to look to William in Charles and Kate's absences, as he represents the monarchy's future as heir to the throne.

"It's an opportunity for him to communicate on behalf of the royal family," Eric Schiffer, the chairman of Reputation Management Consultants, said.

In addition, the public generally responds to younger royals more favorably. Without Kate, as well as Prince Harry and Meghan Markle, William's youth could be a boon for the monarchy, as Kristen Meizner, a royal watcher, told BI.

"They are most focused on the royals when they are of courtship age, getting married, having babies, that kind of thing," she said. "They're not necessarily considered as dazzling or as exciting to the public when they're 60 or 70 or whatnot."

On February 9, the Daily Mail reported that Kate had joined her family at their home in Sandringham, Anmer Hall, for her children's half-term holiday.

The outlet also reported that her recovery was going well at the time.

Kate wasn't photographed during her trip from Windsor to Sandringham.

Although he isn't taking on public-facing duties, King Charles has still been photographed a few times since his cancer diagnosis and the beginning of his treatment.

On February 11, he and Queen Camilla were spotted going to church in Sandringham, and he was photographed meeting with Prime Minister Rishi Sunak on February 21 at Buckingham Palace.

Kate, on the other hand, remained absent, as Kensington Palace released no photos or videos of her.

Typically, William and Kate have released statements as a pair since they got married.

But on February 20, Kensington Palace released a statement on only William's behalf regarding the conflict in Gaza, in which he said he remained "deeply concerned about the human cost of the conflict in the Middle East since the Hamas terrorist attack on 7 October."

"I, like so many others, want to see an end to the fighting as soon as possible," the statement said. "There is a desperate need for increased humanitarian support to Gaza."

William also said he continued "to cling to the hope that a brighter future can be found, and I refuse to give up on that."

In addition to speaking for only William, the statement had a "W" seal at the top rather than the crown featured on messages from the Prince and Princess of Wales as a unit.

On Tuesday, members of the royal family attended a service of thanksgiving for King Constantine of Greece, King Charles' second cousin and close companion. He was one of William's godfathers.

William was set to attend the event alongside Queen Camilla and other family members but missed the service because of a personal matter, Kensington Palace told Business Insider.

A palace representative also told BI that Kate was doing well, but they didn't elaborate on what caused William to miss the event.

Following his absence, chatter about Kate's prolonged absence from the public eye erupted on social media, with users speculating about why she hasn't been seen in months. The princess was trending on X, and thousands of people posted about her on TikTok. "Kate Middleton" was also sixth on Google's list of trending search terms on Tuesday, highlighting how high public interest got in her absence.

On Thursday, Prince William resumed public duty, visiting the Western Marble Arch Synagogue to learn about the Holocaust Educational Trust, as Kensington Palace shared on Instagram.

He sat down with a Holocaust survivor, Renee Salt. Rebecca English, a royal editor for the Daily Mail, reported on X that during the conversation, he spoke on behalf of himself and Kate.

"Both Catherine and I are extremely concerned about the rise in antisemitism," English quoted the prince as saying to Salt. "That's why I'm here today to reassure you all that people do care and people do listen, and we can't let that go."

Kensington Palace also reiterated that Kate was "doing well" in a statement sent to BI on Thursday.

"We gave guidance two days ago that The Princess of Wales continues to be doing well," the statement said. "As we have been clear since our initial statement in January, we shall not be providing a running commentary or providing daily updates."

As of Thursday, Kensington Palace hadn't released any new photos or videos of the princess.