Justin Bieber shirtless (Photo : Twitter: @JustinBieber)

Much to his fans pleasure, Justin Bieber tweeted a super-hot shirtless photo. In the shadowy image, the teenage heartthrob flaunts his latest tattoo - a small crown on his shoulder.  

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The star has been tweeting a lot of shirtless photos lately. With every new picture and new track, the 18-year-old singer is trying his best to prove that he is no longer a little boy anymore. 

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In an interview with USA Today, Bieber confessed that he fears being just another teen singing sensation. The young artist seeks longevity for his career. 

Many times, child stars have a quick fame expiration date. Amanda Bynes, for instance, is headed a downward spiral after being a well-respected and adored red carpet staple as a teen.  Another sad case of a fallen child star is Macaulay Culkin, who is rumored to have found drugs to cope with his unsuccessful career.

The "Boyfriend" singer wants to silence his haters and prove that he's definitely here to stay. "I don't want to be just another teen heartthrob. I know some people are waiting for me to fail, thinking, 'Oh, his time's up'," said Bieber.

Bieber plans to take his work to "the next level" on his Believe world tour.  "Well, I like being the underdog, and this tour is my chance to take things to the next level. I've never put in more hours preparing, because I want [the tour] to be perfect. I want it to be an event." He added, "I'm with a personal trainer every day. I'm rehearsing every day. I want people to see this tour and go, 'Wow that was something I didn't expect'."

The pop star will be using inspiration from music legend Michael Jackson for his choreography.  "I've been watching videos of his concert tours over and over, he's my inspiration."

The "As Long As You Love Me" singer is a global phenomenon with a fortune of over $100 million, selling more than 15 million albums.  The under-21 star has already made it to a top spot as #3 on the Forbes list and has been dubbed the 3^rd most powerful celebrity in the world.

In his latest achievement, Bieber has topped Billboard's 21 under 21 list for the second year in a row.  The pop star lands the number one spot over One Direction, who came in second, Demi Lovato, and girlfriend Selena Gomez, who came in sixth.  

1. Justin Bieber
2. One Direction
3. Demi Lovato
4. Scott McCreery
5. Matt Miller
6. Selena Gomez
7. DJ Porter Robinson
8. Cher Lloyd
9. Earl Sweatshirt
10. Nick Jonas
11. Jackie Evancho
12. Cody Simpson
13. Mindless Behavior
14. Megan & Liz
15. IU
16. Bridget Mendler
17. 3BallMTY
18. Miley Cyrus
19. Madeon
20. Ross Lynch
21. Victoria Justice