Shawn Mendes would pay how much for Justin Bieber's underpants??

Shawn Mendes kicked off his week long takeover of the Late Late Show with James Corden last night and we're already learning so much! He did a special Carpool Karaoke last night that involved a conversation about moving out of his parents' house, selling Justin Bieber's underpants online and his obsession with Harry Potter. Watch below:

 

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