Kelli O'Hara and Matthew Morrison took Carnegie Hall by storm on December 19 and 20 with their holiday concert featuring the New York Pops orchestra and the Essential Voices USA choir. As part of their repertoire, O'Hara and Morrison, romantic costars in The Light in the Piazza and pals in South Pacific, performed the classic Frank Loesser tune "Baby, It's Cold Outside." Yes, we know this duet is normally creepy. But they played it off very well. Check it out below: