updated 04/08/2012 AT 3:55 PM ET
•originally published 04/08/2012 AT 4:10 PM ET
Talk about a surprise engagement.
While singing his hit “Don’t Think I Can’t Love You,” Owen brought Buchanan out on stage for what at first appeared to be a dance. He then got down on one knee and popped the question in front of the audience. He was just missing one thing.
“You’re probably wondering where your ring is, right?” Owen could be heard asking over the speakers.
Referencing the lyrics of the song, he added: “I just said I can’t buy you a big diamond ring or a big old house on the hill, but I promise you I’ll love you forever and ever and ever.”
Owen then finished the song, singing directly to Buchanan, who has appeared in his music videos for “Barefoot Blue Jean Night” and “Eight Second Ride.” The couple then shared a hug and several kisses onstage.
“He was talking about how he’d thrown his hat up on the fifty yard line [during graduation] and now he was here in front of friends and family, and it seemed like the most appropriate [venue], one concertgoer told PEOPLE.
“He seemed to spontaneously decide to bring her out on stage and propose to her.”
Ring or no ring, Owen is clearly happy with his decision. “I’m a happy man,” the singer Tweeted Sunday. “Life is complete.”