"As Head of State, The Queen regularly speaks to world leaders and key diplomatic figures as part of the vital role she plays as a figurehead for the United Kingdom and Commonwealth", a message on the 95-year-old monarch's Twitter account said.
Kate made the comments while speaking with a mother who took a photo of her daughter that was chosen as a finalist in the duchess's Hold Still project.
The Duchess of Cambridge has joked that her children get annoyed when she takes photographs of them, revealing they plead, "Mummy, please stop".
Relating, Ceri responded: 'I know, but I love it. I think when you have children, time seems to go into warp speed, really, and it's just a lovely thing for me.
Queen Elizabeth, her son Prince Charles and his wife Camilla, and the heir's eldest son Prince William and wife Kate will all later join the heads of the some of the world's richest nation who are gathering for a three-day meeting in southwest England.
"These simple moments between loved ones really impacted everybody, actually and has really resonated with lots of people across the country", the duchess said.
She said the image also acknowledged the importance of frontline workers and the different generations who dealt with the crisis.
But according to Anita McBride, a former chief of staff to Mrs Bush, Dr Biden's willingness to involve herself in the shaping of the administration's policies makes her more comparable to Betty Ford: "Clearly [Biden] is an activist First Lady and is very comfortable in that".
"I loved seeing your big cuddle to your daddy", Kate said to the little girl. Cuddles are very, very important.
Poppy struggled with her dad leaving for work as a frontline health care worker throughout the COVID-19 pandemic, and anxious about him every time he left.
Poppy replied: 'Thank you. It must have been so hard for you, Poppy, but I bet you were very fearless'.
Kate regularly shares photos she has taken of her family, rather than using a professional photographer. The exhibition of 100 photos was shown via billboards and bus stops around the United Kingdom and has now been turned into a book.
Her father Mark worked throughout lockdown as a paramedic for the West Midlands Ambulance NHS Trust at his station in Hereford.