VIDEO : Shawn Mendes Wants Beiber's Underwear

On Monday Shawn Mendes participated in a new "Carpool Karaoke" segment as part of a week-long takeover of CBS' "The Late Late Show With James Corden." While driving with Corden, the singer revealed that he would pay no more than $500 for a pair of Justin Bieber's used underwear. Mendes says he would especially consider buying a pair if Bieber played hockey in them, or did another cool activity. Corden then told Mendes that Bieber "wears a new pair of underpants every day" and "sells them online.