Montana Fishburne -- Tested for Playboy

Montana Fishburne really is trying to follow Kim Kardashian's path to fame ... because TMZ has learned Montana recently did a nude "test" photo shoot for Playboy Magazine.

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We're told the photos -- in which Montana goes full-frontal -- were taken BEFORE anyone knew about Fishburne's sex tape.

As you may know, Kardashian was also featured in Playboy in 2007 -- after her sex tape went public.