He was a guest at the wedding when the band, led by Lourdes Valentin, was performing Bon Jovi‘s “Livin’ on a Prayer” when she went over to Jon’s table and sang to him. He kept motioning to her that she was doing fine, but eventually took the microphone and sang a few verses.
Perhaps he did so because she kept botching one of the lyrics. Instead of singing “Take my hand and we’ll make it – I swear,” she sang, “Take my hand and we’ll TAKE it – I swear.”
https://youtu.be/ntvHMxlFasE
