Media outlet Sports Seoul had reported that the pair had been seen in public together, claiming that they had been together for a year.
After Sports Seoul provided proof in the form of photos and a video, representatives for both Sooyoung and Jung have come out to confirm that they are dating.
All K-pop reported SM Entertainment stating: "The dating rumors are true. While they were close as sunbae and hoobae last year, their relationship progressed into that of a couple... Please watch over them fondly."
Jung's representatives were also reported to have said: "He and Sooyoung are dating... We are sorry that we did not respond truthfully the two or so times the rumors were reported.
"At the time, when we asked Jung Kyung Ho, he had said that it wasn't true so we had responded that way before. We are sorry. We will reveal our official statement soon."
The couple are the second pair of celebrities to be outed this year, following the news that Lee Seung Gi and Yoona, who is also from Girls' Generation, are a couple.
Photos in the gallery below show the couple Sooyoung and Kyung Ho in photos by Sports Seoul.