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On Tuesday (December 14), RapFix and MTV News' Sway tagged along with Diddy as the rap mogul went on a whirlwind promotional tour through New York in support of Diddy-Dirty Money's just-released Last Train to Paris.

There were many stops along the way — New York radio station Hot 97, a scorching-hot performance of "Coming Home" on "The View" — but the part of the day that's sure to make the girls scream is when Diddy linked up with Justin Bieber.

A little before 7:30 p.m., Diddy hung out with Justin at a recording studio. They were there because the Grammy-nominated teen idol had an idea for a song and needed to "get it off of his chest," according to Bieber's manager, Scooter Braun. Apparently, this studio is like a second home for the 16-year-old pop star.

But it wasn't all laying down tracks. Braun recalled the first time Bieber met the rap impresario (on the 2009 VMA red carpet), and Diddy gifted Bieber with a Diddy-Dirty Money jacket, declaring him an honorary group member! But that gift probably can't top the 16th-birthday present the Diddy-Dirty frontman gave the Biebs this year.

His big-deal birthday present? A $200,000 Lamborghini Gallardo Spyder.

Before we parted ways, Scooter also dished about Bieber's upcoming 3-D movie, "Never Say Never," calling the MTV Films release "incredible."

Diddy and his Dirty Money ladies, Dawn Richard and Kaleena, are celebrating the release of their Last Train to Paris on Tuesday night with a Ustream party.

Are you excited to hear Diddy and Justin were in the studio together? Tell us in the comments!