Lindsay Lohan — First Shot Fired in Dubai War

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has obtained the cease and desist letter Lindsay Lohan fired off to a Dubai-based party planning company … demanding they stop using her name to promote a NYE party.

We broke the story … Lindsay believes the company has been spreading lies about her … falsely claiming she”s agreed to attend a massive New Year”s Eve bash on a gigantic ocean liner.

In the letter, Lohan”s attorney, Stephanie Ovadia, states the actress “will suffer harm and damage” if the company continues to use her name without permission … and she”s not afraid to sue.

Still no word back from the party people.