Two years, two pop-rock albums and another Disney movie later, Demi and the JoBros return for the sequel, Camp Rock 2: The Final Jam, premiering September 3. In an exclusive interview with Celebuzz, Demi, who recently blew out her 18th birthday candles, said both she and Mitchie have grown up.

“She has more confidence now,” Demi told Celebuzz of her character. “In the first movie she was really insecure and she didn’t really know who she was. Now she’s more driven.

”You could say the same about Demi, who is starring in her very own Disney Channel series, Sonny With a Chance, working on an R&B-influenced third studio album, moving her family into a new house (!) and touring with the Jonases, including Joe, 21, who is now her ex-boyfriend. How does she manage to remain friends with him?

“Well, you have to, ‘cause you work with him,” Demi told us. “When you’re hurt, it’s easy to move on, so it was very easy for me to move on.”

Her advice for fans attempting to get along with their exes is pretty simple. “Suck it up,” she said with a laugh.

And so she’s doing just that, even revealing that she has a crush on a well-known R&B star.

“I’m kind of digging Trey Songz – he’s pretty hot,” she divulged. Though she tells Celebuzz there’s nothing romantic happening with the 25-year-old singer-actor, she said, “We followed each other on Twitter and direct message each other…he’s pretty awesome.”

Trey’s soulful vibe could be an indication of what fans will hear on Demi’s new album, which she hopes to release early next year. Expect what she calls a “new sound,” a blend of hip-hop and dance tracks, and even – brace yourselves — possible duets with Miley Cyrus and Justin Bieber.

“We talked about doing a duo together, like an acoustic or something. That would be really fun to do with her,” Demi told us of Miley. “She’s one of my best friends and she’s super talented, so I’d love to have her on the album.”

The Biebs, who just shared the stage with Miley this week in New York, is also on Demi’s list of potential collaborators.

“He’s a really sweet kid. I’d love to work with him,” she said. “My little sister loves him and I’m a fan so I guess you could say I’ve got Bieber Fever.”

Amidst buzz that Baby Biebs wants to remake Grease with Miley, Demi says she’d “rather do West Side Story” or Broadway’s In the Heights.

For now, Demi is focusing on a new season of Sonny With a Chance (not to be confused with the similarly-named It’s Always Sunny in Philadelphia, which she calls “one of her favorite” shows.) Despite her milestone 18th birthday, she’s in no rush to take on grittier roles.

“I don’t really feel like I need to do that until I step out of my Disney Channel place,” she told Celebuzz. “I’m just kind of waiting until the timing is right, but I feel more adult, just living day by day as a newly 18 year old.”

Camp Rock 2: The Final Jam premeries Sept. 3 on Disney Channel.

Will you tune in to see Demi rock with the JoBros? Should she duet with Miley and The Bieb – and strike up romance with Trey Songz? Weigh in on all things Demi in the comments! Also, check out BuzzNet’s exclusive contest to win an autographed Demi Lovato guitar!!!

Source: Celebuzz