Dan + Shay Tease Unexpected Collaboration and Shay Prepping for Baby No. 2! (Exclusive)

ET caught up with Dan + Shay at Z100's iHeart Jingle Ball 2019 in New York City, which airs as a special on the CW Thursday, Dec. 19 at 8 p.m.. The network will also video stream the mega-concert live exclusively on CWTV.COM and the CW app.