Image Source: Getty / C Flanigan [1]

Garth Brooks had a lot to celebrate during his concert at the LA Forum on Saturday night; first, he welcomed his newly 21-year-old daughter Allie [2] to the stage as his new backup singer and the two performed a few of his iconic hits [3] together before the country singer led the crowd in a rendition of "Happy Birthday" for her. If that wasn't exciting enough, Allie's boyfriend, Jonathan Roberts, was waiting in the wings to ask her a very important question as she exited the stage. In a video posted to Facebook [4], you can see Jonathan getting down on one knee and asking Allie to marry him — meanwhile, Garth was still on stage singing "She's Every Woman."

Allie is the youngest daughter of Garth and his first wife, songwriter Sandy Mahl.