Ten years ago, Donnie Klang was a seventh-grader at Island Trees Memorial Middle School in Levittown; he sang and rapped The Notorious B.I.G. featuring Puff Daddy’s “Mo’ Money, Mo’ Problems” for the annual talent show.

These days, Klang, 23, is promoting his debut single, “Take You There,” featuring P. Diddy.

“That’s a dream come true,” says Klang, taking a break from rehearsals for “Making the Band 4: The Tour,” which kicked off last night at the Hammerstein Ballroom and runs through July. “Even in the old groups I used to sing in, we used to say ‘Bad Boy’ on our tracks. We used to try to find a capellas of Diddy so we could have him rap on our songs. Now, I’m signed to Bad Boy.”

After the current tour, Klang, who still lives in Roslyn, will put the final touches on the rollout of his debut album, set to drop on Aug. 19 to coincide with the return of the MTV series “Making the Band 4,” which will focus on Klang working on his debut, as well as the travels of the show’s other acts, Danity Kane and Day 26.

The successes of those groups, whose albums both debuted at No. 1 on separate weeks in March, isn’t lost on Klang, though he says he’s more interested in having his album define a new style, “something nobody’s expecting to hear.” (“It would be great to beat their first-week [sales], though,” he adds. “It’s the competitive side between us on ‘Making the Band.’”)

Klang says his style brings together his early years in Canarsie, Brooklyn, and his life since moving to Roslyn at age 12.

“They’re two very different places,” he says. “I feel like I took the R&B from Brooklyn and the pop from Long Island. The songs are the kind of songs you listen to on the way to the beach or you pop in when you’re playing ball at the park. And, of course, there are crazy tracks for when you’re at the club.”

cred: newsday