Watch Justin Bieber on 'Ellen': 'I've Done Some Things That Might Not've Been the Greatest'

Michael Rozman/Warner Bros.
Justin Bieber makes a surprise appearance during Ellen's Birthday Show, the final day of her birthday week celebration on The Ellen DeGeneres Show on Jan. 29, 2015.

Ellen's a Belieber!

Justin Bieber made his first TV appearance in a very long time Thursday (Jan. 28) on Ellen. It was DeGeneres' birthday this week, and he stopped by with flowers and Calvin Klein underwear (natch) to celebrate.

"Honestly I haven't been on TV in a while so I'm a little nervous," he shared.

Ellen then talked about Bieber's first time on the program years ago, and how talented she thought he was -- which brings us to today. Ellen admitted she was approached to be part of his Comedy Central Roast but declined because she doesn't like being mean, and Bieber explained why he was offering himself up as the roast's guest of honor.

Justin Bieber Apologizes for 'Arrogant' and 'Conceited' Behavior 

"I think it's just cool to be able to laugh at yourself so," he said with a wry smile. "I've done some things that might not of been the greatest...I just want to be able to...kind of just kind own up to some of the things."

Following his appearance (which taped Wednesday), Bieber made a confessional video where he shared how nervous he was being on the program in front of an audience that he feared was judging him for his recent headline-making behavior.