Over the last few months, Justin Bieber  and Late Late Show host James Corden  have developed a unique bond. The duo has joined forces before during " Carpool Karaoke " segments, singing various hits from Bieber's latest album, Purpose,  and even tackling Alanis Morisette 's " Ironic ." The footage shows the 'What do you Mean' musician appearing on stage unannounced during Corgen's segment, taking over the monologue with mockery by saying "We've got a big show tonight," "Thank you so much for staying up with us" before delivering a string of jokes and garnering laughs from the crowd. "President Obama revealed that his favorite song of 2015 was ' How Much a Dollar Cost ' by  Kendrick Lamar ," the Canadian pop star said. Corden then runs out from backstage dressed in just a towel and bath robe, scolding the band leader Reggie Watts for beginning the music in his absence.