Happy holidays, pals! Here's a look at some of this past week's best Late Night moments (all photos by Lloyd Bishop).
Oscar Isaac showed off his guitar skills with an acoustic cover of Katy Perry's "Roar".
Biz Markie joined Yo Gabba Gabba as a surprise guest on Tuesday.
Michelle Dockery and Jimmy tried out a brand new holiday game - Antler Ring Toss.
Kelly Clarkson stopped by to perform her song "Underneath the Tree.
And in the spirit of Christmas, "Five Days of Christmas Sweaters" returned! Jimmy gave away a very special holiday sweater to one lucky audience member each night this week.