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Lil Boosie's 4 baby mamas have another bun in the oven -- a reality show.

Sources close to the production tell TMZ, Boosie's babes -- Walnita, Tracey, Trivia, and Gerlissa -- have been putting together a pilot episode over the last few months while the rapper's been locked behind bars. Together, they've mothered Boosie's 7 children (aged 4-11).

FYI, Walnita's the baby mama who was arrested back in 2010 for trying to smuggle Boosie drugs in jail.

We're told the reality show will focus on the ladies' unusual friendships that formed as the result of their ... peculiar circumstances. It's unclear if Boosie -- née Torrence Hatch -- will also be participating now that he's free.