Mariah Carey's second Christmas album ('Merry Christmas II You') debuted last month. On an accompanying holiday special, 'Mariah Carey: Merry Christmas to You' (Mon., 9PM ET on ABC), it was clear she's still got the skillz.

A spirited 'O Holy Night' had the audience clapping and cheering before the song ended. As a gospel choir sang backup, Carey showed off her famous five-octave vocal range. "O night, di-viiine," she sang, hitting one of her trademark notes into the stratosphere.