Last night Seth MacFarlane hosted The Gove’s annual Christmas tree lighting event, and Katharine McPhee and Meghan Trainor were there to help. The trio sang some Christmas songs, backed by a 70-piece orchestra!

Katharine joined Seth MacFarlane for a duet of “A Marshmellow World”, before she sang a solo performance of “What Are You Doing New Year’s Eve”. Check out video above.

Katharine looked absolutely stunning on the red carpet, and even posed with Santa! Check out some photos in the gallery below.