Tomorrow Sean "Diddy" Combs, Queen Latifah and Pharrell Williams will host the second star-studded telethon and concert special to raise money for earthquake relief in Haiti.

S.O.S. Saving Ourselves – Help for Haiti, modeled after a similar special for Hurricane Katrina relief, will air live from Miami's American Airlines Arena at 8 p.m. EST on BET, MTV and VH1.

Mary J. Blige, Chris Brown, Wyclef Jean, Lil' Wayne, Robin Thicke and Justin Bieber have signed on to perform at the three-hour event.

Combs says he felt a strong commitment to do more for Haiti.

"I believe it is our duty to come together and help our brothers and sisters in Haiti, especially now, in their greatest hour of need. I have joined forces with Queen Latifah, Pharrell, BET and several of the biggest names in music today to raise funds for the Haiti Relief efforts. Together, we can make a difference," Diddy stated.

Williams added: "The devastation that has occurred in Haiti has broken my heart. My hope is that we can raise enough money to sustain a few of the relief organizations for quite some time, as there is a lot of work to be done over there. The goal is not only to bring immediate relief to Haiti but to also rebuild the country and help the country move forward."

Hope for Haiti Now, the first telethon event to raise money for Haiti earthquake relief, raised $66 million and has since produced a number-one charity album.