AP photographer Charles Dharapak told CBS News he took pictures of the first lady at the Target on Route 1 in Alexandria, Virginia.

The first lady's office confirmed that the pictures showed Mrs. Obama, though it did not immediately respond when asked if it tipped off Dharapak.

"It is not uncommon for the First Lady to slip out to run an errand, eat at a local restaurant or otherwise enjoy the city outside the White House gates," said Kristina Schake, communications director for the First Lady.

In the photographs, the first lady is wearing a Nike baseball cap, sunglasses and a floral-print button-down shirt with a neon v-neck underlay. She is seen holding a pair of Target bags and pushing a shopping cart.