Dr. Jill Biden spilled the tea on her visit with Queen Elizabeth at Windsor Castle just one year before the queen’s death.

The first lady and President Joe Biden sat down to private tea with her majesty during their 2021 visit. It would become the last time they would meet before the queen died at Balmoral Castle on Sept. 8, 2022, at 96.

In Robert Hardman’s new book, “The Making of a King: King Charles III and the Modern Monarchy,” the royal biographer spoke with FLOTUS and recounted the historical visit as detailed in an exclusive excerpt obtained by People.

“For the Bidens, a cherished memory would always be tea with the queen at Windsor Castle in the year before her death,” Hardman, 59, wrote.

Biden recalled how POTUS tried to help the queen during the engagement, but the royal, who was always the pillar of proper etiquette, refused.

”We went up to her apartment. And I loved her sense of independence,” Biden, 72, said. “She had a big teapot. And Joe said to her: ‘Here, let me help you.’ The queen had been quite insistent, however. ‘No, no, no. You sit,’ she told the president. ‘I will serve you.’ “

Once tea was served, the trio had no shortage of things to talk about.

“Here she was with this big teapot pouring tea and we had the best time because she has such a sense of curiosity,” Biden says in the book. “She asked all about American politics and what was going on and [the president’s] perceptions of different people and different events.”

It was, according to Biden, “every American’s ‘picture’ of a quintessential British tea party, especially when ‘her little dogs came in.’ “

In September 2022, Dr. Biden spoke more about her meeting with the Queen and the clear instructions she was given in an interview with Today.

“What I loved about her was that she was really independent,” she explained. “We went up to her living room and they said to us: ‘Don’t talk about family.’ So we went up and so the first thing she starts with is family. So Prince Philip had just died recently and I think she knows Joe. I think she just wanted to talk about her husband.”

When it was time for the beloved and longest-reigning UK monarch to be laid to rest, the Bidens made plans to travel to England.

“Joe and I just decided to attend,” Biden explained to Hardman. “We all grew up with the queen. She was such a big part of our lives. She was just always there and felt like she always would be – a really beautiful, spectacular, amazing woman.”

In addition to the Bidens, 2,000 guests attended the queen’s funeral service at Westminster Abbey, including representatives from 168 countries, 55 presidents and 25 prime ministers.

“The Making of a King: King Charles III and the Modern Monarchy” is set to be released Jan. 18.