Justin Bieber may have declined the chance to join Justin Timberlake's label, but according to a songwriter in the know, the former 'NSYNC crooner is the inspiration for the teen sensation's upcoming album. 

Songwriter Sean "The Pen "Garrett, who has been working with Bieber on the follow-up to the chart-ruling My World 2.0., spoke with Billboard about the direction for the teen superstar's forthcoming album, saying the project will feature more grown-up fare. 

"What we're trying to do with Justin is to segue him into young adulthood," Garrett said of the project, which is also slated to feature production from hitmaker Christopher "Tricky" Stewart. 

"The one great thing about Justin Bieber is the fact that his fans are going to grow with him. So we want all the fans that started out with him to still be intrigued and excited about him, but we want to also stretch out a little bit and make the fans that are 22-23 years old love Justin as well. When Justin Timberlake went from the last album of *N Sync to his first solo album -- I want to say [we're aiming for] that level. That's the bar for the type of song, that level of 'Cry Me a River,' big records." 

Garrett, who has crafted records for stars like Chris Brown and Bieber's mentor Usher, also said he's hard at work on BeyoncĂ©'s next project. However, the songwriter didn't divulge too much information, only revealing that he's "been working with her extremely hard ... she's my favorite." 

While Garrett said the plan for his next outing is to angle Bieber toward a swiftly maturing audience, Bieber himself has refused to categorize his music, insisting to MTV News in December that he's just focused on creating quality records. 

"Whatever comes out of my mouth is just what you guys are going to hear," Bieber explained of his hits. "I don't know, it's not a specific type of music. Whatever music I write, I wouldn't say I'm pop or R&B or country or anything: I would just say it's just good music," 

source:mtv.com