Belle Thomas, a four-year-old girl and her brother, Preston, were staring into the camer smiling. Just then, the former president of US strides into the frame.

Former President Barack Obama has commented on his now-viral photobomb. The 44th president of the United States was spotted in the background of a photo of two children posing under cherry blossoms in Washington, D.C., posted to social media Tuesday.

The former president strolled by behind the children, wearing a baseball cap, a white long-sleeved shirt, dark-colored pants and sneakers.