Katharine McPhee Joins Fiance David Foster at The Grove's Christmas Tree Lighting

Katharine McPhee sits in the front row with fiance David Foster while attending Christmas at The Grove on Sunday night (November 18) in Los Angeles.

David played the piano during the tree lighting event while Pia Toscano performed the song “O Holy Night.”

Also in attendance at the event were David‘s daughter Sara Foster and her friend, jewelry designer Jennifer Meyer.

Highlights from this year’s tree-lighting ceremony will be included in the CBS holiday special A Home for the Holidays, which will air on Friday, December 21.