The 17-year-old pop star is making a festive album and was joined in the studio by his mentor - who signed him to his Raymond Braun Media Group (RBMG) label - to duet on a Yule Tide hit. Justin tweeted: "just finished a late nt in the studio for the christmas album...it is OFFICIAL...my big bro @UsherRaymondIV is on the album with me! #EPIC (sic)" The `Baby` singer insists the track is very Christmassy and he is really pleased with what he and Usher - full name Usher Raymond IV - have produced. He added in another twitter post: "this duet with me and @USHERRAYMONDIV for #christmas is CRAZY!!!" Justin is teaming up with a host of music stars for his Christmas record, including The Band Perry and, according to rumours, Taylor Swift and Sean Kingston. He has already confirmed he has recorded the track `Falalalala` with Boyz II Men and the LP is being produced by Kuk Harrell.