Justin Bieber's new album will reflect his transition from child to adult

According to his producer Kuk Harrell, Bieber's Xmas delivery Mistletoe helped bridge the gap between his debut tracks like "Baby" and the more mature releases he is set to unveil next year.

"We can't just throw him into the adult game right away. It has to be the proper transition," Harrell told MTV News.

"The Christmas album was really important because it gave everybody the opportunity to hear him, see him and get used to his voice changing."

Harrell said Biebs and his fans were adjusting well to his vocal developments.

"I think he's pretty good right now. It's just a matter of him settling (into) where he is," he said.

"The only conversation we've had about Justin's album that we're about to do is it's really important that it's the proper transition because we've seen him (with) "Baby" now we're watching him grow up.

"That was a huge thing going into this album. We were able to get a running start on where he's at vocally 'cause it's a natural thing. When his proper album comes out, everybody's going to really be looking at that."