Pentatonix always blows us away with their Christmas covers, but their latest is on a new level. During their A Very Pentatonix Christmas holiday special, the a cappella group gave a special performance of "How Great Thou Art" with Jennifer Hudson. Not only does their new addition, bassist Matt Sallee, join in for the performance, but Hudson's incredible vocals will surely bring tears to your eyes. Seriously, we have CHILLS. Catch the video above.