Fans Steal The Show
This is one of the few instances where the fans steal the show, and the stars are merely spectators in the photo. Matt Smith and Karen Gillan, two actors from Doctor Who, are photobombing (yes, you read that right) as a guy gets down on one knee to propose to his girlfriend.
The stars are eager to participate at that time, and the two fans appear to be unperturbed by the presence of “strangers” in one of their most memorable events. It’s very probable that the presence of the actors added to the experience.