Yep, Jake Owen spilled the beans about singing at Pearce's wedding ... but did you know that Pearce's "I Hope You're Happy Now" duet partner Lee Brice also had a wedding song slip-up of his own?
"I was like, 'Gosh -- remember Reba [McEntire] and Brooks & Dunn, Tim [McGraw] and Faith [Hill], all those songs that just wrecked me back then?' I wanted one of those ..."