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Alexis Neiers is offically an inmate of the women's jail in Lynwood, CA ... and here's her mugshot to prove it.

The Pretty Wild star turned herself in yesterday in Los Angeles to begin serving her 180 days in prison for her involvement in the burglary at Orlando Bloom's home.

Neiers admitted she was on Bloom's property the night of the burglary but claimed she was drunk. As a result, Neiers says, she doesn't remember taking anything. However, detectives working on the case have testified that a security camera caught her leaving with bags of loot.

This 18-year-old reality show starlet is certainly getting a reality check.