The "Amazing Spider-Man" co-stars were seen smiling and chatting while taking a stroll around London's Covent Garden, reported People magazine.
In the pictures surfacing online, Stone, 27, is seen wearing a low-cut top and baggy culottes with denim jacket draped over her shoulders while walking next to her former lover, who was sporting a dark-colored cardigan paired with jeans and black sneakers.
However, the two are not rekindling their romance and are just friends.
"They're definitely not dating," a source said.
Stone and Garfrield, 33, began dating in 2011 while working together on "The Amazing Spider-Man".