Khloe Kardashian Lawsuit -- Transgender Sues for Assault

Khloe Kardashian is being sued by a transgender woman who claims Khloe beat the crap out of her outside a Hollywood nightclub.

Chantal Spears -- also know as Ronald Spears -- claims on December 5, 2009, Khloe violently struck her "in and about her body," causing serious injuries.

TMZ broke the story ... the incident occurred outside Playhouse nightclub on Hollywood Blvd., after Chantal/Ronald allegedly walked up to Lamar and told him he was "too young to be married."

Chantal/Ronald told cops at the time, Khloe "pushed and hit me." No one was arrested or cited.

Chantal/Ronald says in her lawsuit she did not provoke anyone.

She's asking for unspecified damages.

No comment so far from Khloe.