The Oscar-winning actress has shared on Instagram the promo material for the song, titled First Christmas which will drop on 29 November. "I can't believe it's finally here! My debut holiday single, First Christmas, is coming out Friday, November 29th. So excited to share this song with you all.” First Christmas is now available to pre-save on many music streaming services. Many of Diane's Instagram followers were thrilled by the news. "I will be calling my local radio station to request it, Diane!" one user claimed, while another gushed…