Diddy‘s parties were legendary in Hollywood circles, and he looked like the king of the world in video from his 2010 New Year’s party … footage of which TMZ has just obtained.

The rapper hosted a soirée in Miami, Florida on December 31, 2009 to ring in the new decade … and, video from the event serves as a reminder of just how popular all his bashes were.

Check out the clip … the party is going down at a beautiful mansion with a massive pool in the backyard — and tons of people gathered around Diddy, who’s speaking to the assembled group through a P.A. system.

It’s a lot of shout-outs to his famous friends … including DJ Khaled, Chris Brown, Rick Ross, Drake and Busta Rhymes. A couple of them even appear in the video — wishing Diddy a very happy new year straight into the camera.

Diddy chats up a woman in one of the clips who seems to be having a great time … before breaking off the convo to dance with one of his pals.

The group lights off some sparklers when the clock strikes midnight — and there’s lots of cheering … but, overall the party seems pretty tame.

As you know … Diddy isn’t throwing any parties these days — he’s locked up in MDC Brooklyn, a notorious federal prison on multiple charges related to alleged sex parties called “freak-offs” authorities said he threw over the years.

Diddy has denied all the allegations against him … and, his team has fired back at civil lawsuits filed against him making a number of different allegations against him — calling them all false.

We spoke with one of Diddy’s lawyers, Teny Geragos — she recently talked to us about the sex tapes allegedly involving Diddy … explaining none show other celebs or minors, and basically calling civil attorney Tony Buzbee an ambulance-chaser.