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With the help of his partner, a South Dakota police officer pulled off a surprise marriage proposal to his paramedic girlfriend, and it was all caught on dash cam!

The Rapid City Police Department posted the adorable video to Facebook on April 27, and it's quickly gone viral.

It shows Officer Nick Allender's partner initiating a traffic stop of Sarah Stewart, Allender's girlfriend and a firefighter and paramedic for the Rapid City Fire Department.

The officer asks Stewart to sit inside his patrol car while he runs her info, as it's raining.

As Stewart approaches the cruiser, Allender emerges. His partner hands him the ring box, and he quickly drops to a knee.

Stewart covers her mouth in shock, but it doesn't take long for her to say yes.

"I knew the engagement was coming ... we had talked about it ... but I had no idea that it would be like that," Stewart told ABC News. "I honestly thought I was just being pulled over."

"And then I saw Nick get out... and it was when I saw the ring box... then I knew what was happening,"

Watch the sweet moment above.

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