Is that the sound of silver bells or the screams of fervent fans? Highlighted by one of the most succssful R&B groups of all times?

Justin Bieber is dropping more and more hints about his charity Christmas album, with more recording getting done this week. Apparently the 17-year-old pop star has tapped Boyz II Men for some holiday cheer.

"2day i woke up and realized that the group that made me want to sing @BoyzIIMen are now on the christmas album singing with me. #DREAMBIG," Bieber Tweeted. "I used 2 listen to their music and practice the runs. that is how i learned how to sing. now im in the studio with them making music 2gether."

The quartet replied on their Twitter account: ""It was a pleasure! Remember what we talked about in the studio Lil bro! Let's do it again sooner than later!!"

Last month, Bieber said last month that the set would include "some classics and then some originals." The plan is to have the set finished recording by the end of the month, and then the teen scream will be starting on his next album to follow-up "My World 2.0," out last year.

Boyz II Men have joined a long line of collaborators who have stepped in the studio for Bieber. Ludacris, Kanye West, Raekwon, Usher and more have all shared songs (or steps) with the Island signee