Before getting down on one knee in front of the sold-out crowd, Pardi explained to the concertgoers that the Ryman Auditorium was one of his and Duncan's very first date spots.
The country crooner sweetly proposed as the surprised and elated audience cheered him on, and the pair earned a standing ovation after Duncanq said "yes," and the couple shared a sweet embrace and a kiss.
Fellow country singer Dierks Bentley celebrated the big news with a sweetly supportive Instagram post, in which he shared a snapshot of the special occasion.
"My man! @jonpardipics crushing the @theryman stage and crushing life... so proud of you pal. Killer show with my all time fav encore," Bentley wrote alongside the pic. "Congrats to you and @summerfawn_duncan."
Speaking with ET in recent months, Pardi marveled over his ladylove, explaining, "Life with Summer is awesome… When it comes to singing about losing her, it’s a big no for me. I definitely want to make her happy."
"I’ve had my fair share of crazy girlfriends," he jokes. "So it’s nice to be in a totally sustainable relationship... I mean, I still do dumb [things], I’m a guy, but for the most part, I’ve got to pat myself on the back. I’ve been a good boyfriend and it’s nice to really work to make somebody feel loved and feel happy... she’s worth it."