Kevin Moran and Molly McGinnis from Pennsylvania have been together seven years - they're high school sweethearts.
While they were finishing up their Christmas shopping, Kevin casually suggested that they get their photos taken in a nearby booth before heading to dinner to celebrate their seventh anniversary.
The couple start off smiling for the first photo. Kevin then pulls out a ring - and the camera captures Molly's reaction and the happy moments just after.
As well as photos, the booth also took a video of the romantic proposal which Kevin then posted to Reddit.
The video has been widely shared online as people seem quite taken with the sweet gesture and genuine, happy reactions.
Kevin told WPVI-TV:
"We are just so excited that everyone gets to see how happy we are,