Raz B Hypes Up B2K Reunion on 'TMZ After Dark' Tour Fueled by Monster Energy

Raz B only needs two things to get it popping on the "TMZ After Dark" tour ... a girlfriend and a Monster Energy drink.

The B2K rapper hosted our Saturday night tour this past weekend and he had our bus hyped, singing the boy band's throwback hits and sprinkling in some new jams as folks partied all over Hollywood.

Raz B belted out B2K's "Girlfriend" and previewed the band's upcoming reunion tour ... in between stops at Hollywood hot spots like Saddle Ranch, where everyone got hyped on Monster. Raz B got it going first, and then everyone followed suit with a Monster Energy in hand.

Check out the videos ... "TMZ After Dark" really is the best party in Hollywood, and Raz B took the baton from some of our previous celeb hosts -- like Ray J, Master P, Jerry O'Connell and Farrah Abraham, just to name a few.

Our Saturday night "TMZ After Dark" tour is fueled by Monster Energy ... check out their website to learn more! We hit the road in Hollywood at 7:30 PM and bring our party on wheels to some iconic bars, like Frolic Room, Saddle Ranch, Rainbow Room, Bar Next Door, Scum & Villainy, Burgundy Room ... and Tom Sandoval, Tom Schwartz and Lisa Vanderpump's place, TomTom.