US President Joe Biden and his wife arrived at RAF Mildenhall, in Suffolk, on Thursday.
Mr Biden will meet with Prime Minister Boris Johnson for face-to-face talks before the G7 summit officially gets underway on Friday.
Mrs Biden, 70, will meet Mrs Johnson, 33, over tea before touring St. Michael’s Mount off the coast of Cornwall, it was announced on Wednesday.
“The First Lady and Mrs Johnson will meet separately over tea and then tour St. Michael’s Mount off the coast of Cornwall.”
Mr and Mrs Johnson married at Westminster Cathedral on May 29 in a Catholic ceremony attended by 30 guests, including their son Wilfred.
The pair also sent save-the-date cards for a wider celebration for next year July, the Daily Mail reported.
Mrs Johnson has been given the responsibility to host leaders’ spouses when they arrive to the UK for business.
She will welcome Mrs Biden as well as France’s First Lady Brigitte Macron, German Chancellor Angela Merkel’s husband, and Sophie Gregoire Trudeau, the wife of Canadian prime minister, Justin Trudeau.