Justin Bieber (Kate McKinnon) strips down and wreaks havoc with his childish antics on set for new Calvin Klein underwear ads with model Lara Stone (Cecily Strong). [Season 40, 2015]#SNLSubscribe to SNL: https://goo.gl/tUsXwMGet more SNL: http://www.nbc.com/saturday-night-liveFull Episodes: http://www.nbc.com/saturday-night-liv...Like SNL: https://www.facebook.com/snlFollow SNL: https://twitter.com/nbcsnlSNL Tumblr: http://nbcsnl.tumblr.com/SNL Instagram: http://instagram.com/nbcsnlSNL Pinterest: http://www.pinterest.com/nbcsnl/