The AP reports that the two stars, who both recently released holiday LPs, will be joined by Jessica Simpson, Josh Groban and Welsh mezzo-soprano Katherine Jenkins for the Christmas In Rockefeller Centre televised broadcast.
'Pyramid' singer Charice and rocker Sheryl Crow are to perform as well.
This year's 74-foot Norway spruce tree was donated by the Acton family of Mahopac, New York.
The tree lighting ceremony has been held annually in New York City since Rockefeller Plaza opened in 1933.
Christmas In Rockefeller Centre airs tonight at 8pm ET/7pm CT on NBC.