Kate Middleton makes her first major appearance since finishing chemotherapy

Kate Middleton made her first major official appearance since announcing she had completed preventative chemotherapy treatment for cancer.

The Princess of Wales, 42, attended the British Royal League Festival of Remembrance on Saturday alongside other members of the royal family, including her husband, Prince William, and her father-in-law, the King Charles III, who is currently receiving treatment for cancer.

According to the BBC, Charles received a standing ovation from the crowd when he arrived at the venue.

Held at the Royal Albert Hall in London, the event is part of the UK's annual Remembrance Weekend, which celebrates members of the British and Commonwealth armed forces community and pays tribute to fallen soldiers.

Middleton was photographed standing and clapping with members of her family as they watched the memorial concert from the royal box.

Kate Middleton made her first major official appearance since finishing her chemotherapy treatment. (Chris J. Ratcliffe – WPA Swimming Pool/Getty Images))

The princess wore a long-sleeved black dress with a bright red poppy pin for the occasion. The flower traditionally symbolizes hope and remembrance of those killed in war.

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Middleton paid tribute to her late mother-in-law, Princess Diana, through her jewelry. She wore the Collingwood pearl earrings as well as the sapphire and diamond engagement ring that once belonged to Diana. Kate also accessorized with a pearl necklace.

Queen Camilla, Charles's wife, was not present at the event. Earlier on Saturday, Buckingham Palace announced that Camilla would miss Remembrance weekend events as she recovers from a chest infection.

“Following doctors' advice to ensure a full recovery from a seasonal lung infection and to protect others from any potential risks, Her Majesty will not attend this weekend's Remembrance events,” the statement read. press release from People.

“While this is a source of great disappointment to The Queen, she will mark the occasion privately at home and hopes to return to public duties early next week,” the statement added.

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The princess joined her husband, Prince William, and father-in-law, King Charles, as well as other members of the royal family at the Festival of Remembrance. (Chris J. Ratcliffe – WPA Swimming Pool/Getty Images))

According to the BBC, Middleton and Charles are also expected to attend the Remembrance Sunday ceremony at the Cenotaph War Memorial in Whitehall, London, where the monarch will lay a wreath.

In February, Buckingham Palace announced that Charles, 75, had been diagnosed with cancer and was undergoing treatment. The monarch returned to public duties at the end of April after taking a three-month break to focus on her health.

In March, Middleton revealed her own cancer diagnosis and said she was undergoing preventative chemotherapy. In June, she made her first public appearance since revealing she had been diagnosed with cancer while attending the Trooping of the Color ceremony in June.

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The annual UK Remembrance Weekend celebrates members of the British and Commonwealth armed forces community and pays tribute to fallen soldiers. (Chris J. Ratcliffe – WPA Swimming Pool/Getty Images)

In a heartfelt video shared in September, Kate revealed she was cancer-free after completing treatment and shared her hopes for the future.

“Although I have completed chemotherapy, my road to healing and full recovery is long and I must continue to take each day as it comes,” the princess said. “I do, however, look forward to returning to work and undertaking some additional public engagements in the coming months, when I am able.

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Over the past few months, Middleton has participated in a handful of public events and recently joined William in Southport, where they met with the families of the young victims who were killed in mass shooting during a Taylor Swift-themed dance class in July.

Middelton announced she was cancer free in September. (Chris J. Ratcliffe – WPA Swimming Pool/Getty Images)

Earlier this week, William opened up about a “brutal” year following his wife and father's cancer diagnoses.

“It's been terrible. It's probably been the hardest year of my life,” William said Thursday, according to People magazine.

“So trying to overcome everything else and keep everything on track has been very difficult,” he added.

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“But I’m so proud of my wife, I’m proud of my dad, for handling the things that they did,” William said. “But, from a family point of view, it’s been, yes, it’s been brutal.”