Actress Mindy Cohn (Natalie from The Facts of Life ) also sang background vocals on the track after being invited to the mic by Quincy Jones during a session [7, 14].
One of the song's most charming "Easter eggs" is the background vocals. The "na-na-na" and "P.Y.T." responses were performed by Michael’s sisters, Janet and La Toya Jackson . Their inclusion adds a family warmth to the track that feels genuinely festive. The "Bridge" and the Vocoder michael jackson pyt pretty young thing