Remember the days when Mark Wahlberg was Marky Mark and he performed in front of thousands of people in his underwear? Who doesn’t? You might also recall that all that pants dropping earned him a deal modeling Calvin Klein underwear. Wahlberg stopped by Conan on Thursday where he was asked about a more recent Calvin Klein underwear model, his friend Justin Bieber. Besides just asking about it, Conan was kind enough to show us a side-by-side of the two.