According to the BBC, the Obamas are believed to have visited Big Ben and Parliament after flying in early Monday morning.
The Obamas also met with Sarah Brown, wife to British Prime Minister Gordon Brown, at 10 Downing Street. Downing Street spokesmen say that the first lady did not meet with Prime Minister Brown himself, the Associated Press reports.
Michelle, Malia, and Sasha joined President Obama in Paris Friday following the president's visit to Saudi Arabia and Egypt earlier in the week.
Mr. and Mrs. Obama attended D-Day commemorations in Normandy Saturday and had dinner together at a Paris bistro. The first lady and her daughters went shopping in Paris Sunday while Mr. Obama returned to the United States.