Justin Bieber Serenades Ellen with 'Yummy'

I'm so happy. Our first guest is here for my birthday show. He's always been one of our favorites around here. He's been here many times...I think this is the 27th time. Look at this. Here to make his daytime television debut, welcome the adorable Justin Bieber. Let me tell you the time. I'll tell you once. And I'll be your only boy. I'll tell you once. I'm on my way to surprising Paige. She says she is my biggest fan. Here we go, Elena. Her songs are very motivating. Is it my mother again? Hey. How are you? Here you have.

These are for you. Are you kidding. No, I'm not kidding. Oh Lord! I love you! Is it too late to ask for forgiveness? Because I'm missing something more than your body. Oh oh oh. Follow my finger, not your head, just your eyes. Only your eyes, not your head. Go faster. Go very fast. Then you're not taking this seriously. Oh Lord. I'm sorry. I have one more surprise for you. Oh, it's true. Justin will be in Michigan. In fact, we're going to give $1 for every ticket to your school. Let's welcome Justin Bieber. Yes, I know I disappointed you.

Is it too late to say sorry now? I'm sorry. Let's welcome my friend Justin Bieber. Yes, you have that delicious, that delicious, that delicious, that delicious. Yes, you have that delicious yum, that delicious yum, that delicious yum. Say the word, on my way. Yes baby, yes baby, yes baby, any night, any day. Say the word, on my way. Yes baby, yes baby, yes baby, in the morning or afternoon, say the word, on the way. Well, aren't these beautiful? Thank you very much, my friend. This is your 27th time. And this is the second time you have attended my birthday program, which is a pleasure for you to be here.

Is awesome. Remember, did you see that montage we just showed? I did. Yes, it was right there. Do you remember all of those? I do, yes. They were all so different. It was in different places and times in my life, different places in my life. I kind of grew up on your show, now that I think about it. Yes. You owe me a lot. Yes. No, I know what you mean. No, you don't. But if you want, you know, a little cut, I'll take it. Do you have a favorite memory from something you did on the show?

I love the fact that what you do so brilliantly is create an incredible atmosphere so that I feel like I can be myself. And I just... I really appreciate it. Plus, I love doing all the pranks and stuff. Those are all fun too. Moments like that to be silly and, like I said, be myself, that's a big part of who I am. I'm just a stupid person. And you have always accepted me for me. And that is an amazing quality. So thank you very much. It's true. And I love you for who you are and also because you really came on the show when you were first discovered.

And I love the documentary. And it really explains to people what you went through and why you needed to take a break. Yes. Are you happy with that? I'm very happy with that. Yes, thanks for asking. Yes, it's really good. And they talk about how your dopamine levels, for example, what that does to a person's brain at such a young age or at any age. When you're surrounded by that kind of noise and emotion for so long, did you realize that that was, looking back, what it was doing to you? I was 15 when I really started touring.

And with that said, you're on tour: dopamine depletion. And the best way for me to describe it is that I go out there every night. And I'm giving, giving, giving, giving, giving. And I don't understand how to get the proper nutrients that I need and all that kind of stuff, because I'm a kid. And I'm also doing the rest of the stuff, growing up and experimenting with drugs and doing all that kind of stuff. So I didn't realize what a crazy... toll it would take on my body. So yes. It was too much. It was a lot, yes.

And I'm so glad you're back because you took a break. Thank you. And this makes me so happy that you are singing again. You are writing again. The songs are great. Thank you. There's a guitar back there. I don't know if you noticed it. Yes. I brought you flowers. But I also really wanted to sing something to you. Good OK. Sure? OK. You don't have to beg me. As you know, I have a song called "Yummy." So I tuned my guitar backstage. And now it's higher. So I have to find out if I can still play these notes. (SINGING) Yes, yes, you have that delicious, that delicious, that delicious, that delicious.

Yes, you have that delicious yum, that delicious yum, that delicious yum. Say the word, on my way. Yes baby, yes baby, yes baby, any night, any day, say the word, on my way. Yes baby, yes baby, yes baby, in the morning or afternoon. I think it's his birthday too. Shall we sing happy birthday? We need everyone in this room to sing with me. Do you think you can do that? Yeah! Ready? (SINGING) Happy birthday to you. Happy Birthday. Happy birthday dear Elena. Happy Birthday. Great job. Great job. Great job. Thank you all. That's a little preview.

More with Justin after this. We'll take a break.