Rapper Pitbull torpedoed a famous Egyptian singer's music video -- after the singer spent hundreds of thousands to produce it -- and it's all Akon's fault ... this according to a new lawsuit.
Singer Tamer Hosny filed the suit against Akon ... claiming he paid the singer $300K for both him and Pitbull to sing on Tamer's new song "Arabian Knight."
Tamer claims Akon promised to deliver Pitbull for the shoot, so it's his fault and he's on the hook.
Tamer says it's double the disaster because he had to pay $100K for cameras and crew the day of the shoot ... all for nothing.
For some reason ... Pitbull was not sued.
Calls to Akon's camp weren't returned.