Shawn Mendes joined James Corden in a new Carpool Karaoke!
The "In My Blood" singer declared his love for the Harry Potter stories. He loves it so much, he even dressed up like Harry Potter AND Dumbledore!
Mendes also talked about his Canadian roots and taught Corden how to play ice hockey.
Bonus: How much money would Mendes pay for Justin Bieber's underwear? Watch the video to find out!