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(TMZ) - Mama June has not only been lying ... she's been exposing her young daughter to a child molester.

Take a look at this pic on TMZ -- taken last month.  A smiling June sits on a staircase as her 9-year-old daughter, Honey Boo Boo, is touched gently by the hands of a man who forced oral sex on another one of June's children ... who was a year younger than Honey Boo Boo when she was violated.

June lashed out after we posted a pic of Mark McDaniel -- fresh out of prison -- and her in a hotel room, claiming she hadn't seem him since he was released from prison in March.

But then we posted pics of the 2 of them shopping for a house.  And then we posted a pic of June buying him a car.