Pentatonix has recently released a cover of "Mary, Did You Know" and Google shows the right YouTube music video when you search for [Mary, did you know]. Unfortunately, the information placed below the video thumbnail is inaccurate. Kenny Rogers and Wynonna Judd aren't the right artists, the song is not from 2002 and the album is not called "The Gift".
"'Mary, Did You Know?' is a Christmas song with lyrics and music written by Mark Lowry and Buddy Greene. It was originally recorded by Christian recording artist, Michael English on his solo debut album in 1991. A duet version recorded by Wynonna Judd and Kenny Rogers peaked at No. 55 on the Billboard Hot Country Singles & Tracks charts in 1997," informs Wikipedia.
Fortunately, there's a "Feedback" link that lets you report mistakes.