Stay Zedd Feat. Alessia Cara
25 October 2015, 20:15
As well as helping save water, Biebs revealed his underwear preference AND almost lets slip about a secret collaboration...
What's the secret to Justin's PERFECT hair? Who's his favourite YouTuber? And the most important question of all... DOES HE PEE IN THE SHOWER?
Hit play on the video above to see how Justin copes under pressure - AND the awkward moment he almost revealed a little too much about his collaboration with Ed Sheeran.