That's right, seven years later and he's still in our hearts. But why? What makes Justin Bieber such a heartthrob, and why does he never seem to go away? Well, I think I have it all figured out. Here's why the world will forever have Bieber fever:

1. The famous "Hair Flip."

This is what has us all hooked. With his new hair, it's nearly impossible to recreate the "flip" he used to do with the famous Bieber hair. As upsetting as this is, time will heal us all.

2. His voice has always been angelic, puberty or not.

His voice will always be amazing, but let's face it, Our little Justin is gone. We've learned to adjust to his new voice, and simply embrace it.

3. He reminds us of our childhood.

Whether you like the new Bieber or not, his songs will always take us back to being 13 and listening to "Baby".

4. His songs are pretty catchy, there's no denying it.

Justin Bieber has never been known to cuss, or sing about anything highly inappropriate. His music is easy to listen to and perfect for any occasion.

5. He's a good boy by day, bad boy by night.

We're attracted to his sweet heart, but also his bad boy side. He's viewed in the media as a "punk," but his music portrays a completely different message.

6. He might be a punk—but he's our punk.

He's done some pretty stupid things in the past, but c'mon. We've loved him since day one, why stop now?

7. Shirtless Justin is uh-mazing.

Old Justin Bieber didn't really have any abs. But new Bieber definitely does, and we can't get enough. (Neither can he.)

8. His heart.

Deep down we'd like to think Justin is a great guy. It would be really hard to be constantly in the spotlight and stay humble. He does an OK job for a 20-year-old boy with millions of girls who are obsessing over him.

9. "One Time" will forever be stuck in our heads.

It only took one time to get everyone hooked. (We're still convinced our invitation was lost for the party he threw at Usher's.)

10. His dance moves.

Because Justin Bieber wouldn't be himself if he didn't whip out the moonwalk every so often.

11. His smile.

Before Justin could even open his mouth, we were already falling in love. Regardless of how old he gets, the Bieber smile will never go away.

So if anyone has the cure for Bieber fever please let me know. I don't see mine going away anytime soon.