In addition to Archie's cameo on the special, the couple also have a message of their own, which is "a song that means so much to us."
"'This Little Light of Mine' played at the very end of our wedding while we were walking down the steps of the church," Meghan, 39, recalls of their 2018 nuptials at Windsor Castle. "It was the music that we wanted playing when we started our lives together. Because as we all know, 'darkness cannot drive out darkness, only light can do that.'"
Harry, 36, adds, "The message of this song is one we hold so dearly. It’s about using the power we each have within us to make this world a better place. ...Happy New Year, everyone."
For more on the adorable family of three, watch the video below.