If you, like me, are partial to the traditional 30-day cycle of Psalms, this is one of the few days of the year you should feel free to step away from it. The classical Prayer Books appointed special psalms for Morning and Evening Prayer on Christmas Day: 19, 45, and 85 in the Morning, and in the Evening, 89, 110, and 132.
However, if you want to opt for a shorter version of this, the 60-day psalter in the 2019 Prayer Book does appoint holiday-appropriate psalms for several days in the year, including Christmas Day. The entries there are 19 or 45 in the Morning, and in the Evening 85 and 110. As you can see, these are drawn from the original Prayer Book psalms for Christmas Day, just pared down a bit. Psalm 89 is pretty long, for example. So take advantage of the freedom afforded in this prayer book and enjoy some traditional Christmas Psalms today, whether it is the longer list of olden times or the shorter list in the new.
And, of course, have a merry Christmas.