WATCH: Texas teen walks for first time in months, stuns prom date in heartwarming viral video

Photo credit: Tobias Titz / Getty Images

Credit: Tobias Titz / Getty Images

Credit: Tobias Titz / Getty Images

Photo credit: Tobias Titz / Getty Images

A video of a San Antonio teen's heartwarming surprise for her prom date – and his emotional reaction – has gone viral.

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According to KSAT, Health Careers High School senior Morgan Coultress, 18, has had conversion disorder, which affects the use of her legs, since she underwent surgery in June. She said she couldn't walk unassisted for 10 months, the station reported.

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So Coultress prepared a special surprise for her prom date, Tarik Garcia.

On Saturday, a camera captured the moment that Garcia walked into Coultress' home – and the shocked look on his face as Coultress took several steps toward him.

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The clip, which Coultress shared on Twitter, has been viewed more than 13 million times.

Coultress, who was crowned prom queen that same evening, said she hopes to walk at her graduation next month, KSAT reported.