Haley makes a duet with fellow 'American Idol' alum Casey Abrams during the annual event taking place at the Nokia Plaza, while Pia joins forces with Il Divo.
With holiday fast approaching, a bunch of star-studded events were held to celebrate the upcoming festivity. One of those gigs was Christmas Tree Lighting Ceremony which featured "American Idol" alums Haley Reinhart and Pia Toscano performing live.
Wearing a red tight-fitting dress with long sleeves, Haley took the stage at the Nokia Plaza with fellow "Idol" outcast Casey Abrams. They made a jazzy duet of classic holiday tune "Baby It's Cold Outside". Meanwhile, Pia who also wore a red outfit shared the stage with Il Divo.
The December 2 concert also saw performances by JoJo and "The Voice" champ Javier Colon. The other stars coming to the event to help celebrate the holiday season were jazz vet Patti Austin and Olympic gold medalist Evan Lysacek.