One of the guest shared the moment on YouTube, which has everyone enjoying the impromptu gig.
He took to the stage alongside a wedding band led by local jazz musician Lourdes Valentin and lent his vocals to a specially arranged version of his 1986 hit, reported Contactmusic
"I was very surprised when Jon did then grace us with his talent," Valentin revealed. The couple who actually got married have preferred to remain anonymous.