Shawn Mendes & James Corden Have An A Cappella Argument -- See Them Fight Over Spice Girls, Sia, & TLC!

Man, Shawn Mendes is really leaning into making fun of how old late night hosts are!
After relentlessly teasing Jimmy Fallon about his age, the Canadian pop star stopped by The Late Late Show — where James Corden turned it into a bit!
Actually, he turned it into a Riff-Off with a cappella group The Filharmonic providing backup!
Video: James & Anna Kendrick Do An Aca-AWESOME Riff Off!
Shawn and James fought over whether music was better today or yesterday, and both their arguments were pretty strong: we’re talking Spice Girls, Sia, TLC, and more!
Ch-ch-check it out (above)!
PLUS, speaking of new music, is Shawn really going to collab with Niall Horan from One Direction? See him tell James all about it (below)!