It’s official, Guerilla Union has announced the line-up for their 2012 Rock The Bells Festival Series, revealing headliners Kid Cudi, J. Cole, Wiz Khalifa, Atmosphere, and special guests Bone Thugs-N-Harmony.

Via an invite-only launch party at Los Angeles’ House Of Blues venue on the iconic Sunset Strip Tuesday (May 15), veteran freestyler MC Supernatural took the stage for their annual tradition, in which he revealed this year’s line-up while freestyling (off the dome).

Also during the launch party/press conference, Guerilla Union founder Chang Weisberg revealed that the annual music festival has expanded to two-day runs in four major North American markets.

Things kick off in Bernardino, Calif. on August 19 and 20 at the NOS Events Center. It will then head to Mountain View, Calif. (Bay Area) on August 25 and 26 at the Shoreline Amphitheatre. Then, finally, things will wrap-up on the east coast in Newark, NJ on September 1 and 2 at PNC Arts Center.

Other acts for this year’s festival include: 2 Chainz, A$AP Rocky, Big Daddy Kane, Deltron 303, Dipset, DJ Lance Rock and Friends (Yo Gabba Gabba), DJ Quik, E-40 & Too Short, Eligh, Grouch & Zion I, Fashawn, Hit Squad (reunion), Ice Cube, Immortal Technique, Kendrick Lamar, Lupe Fiasco, Mac Miller and Missy Elliott and Timbaland, and many more.

For full details, visit RockTheBells.net.