02/09/2009 05:12 am ET | Updated May 25, 2011

Levi Johnston's Mother Speaks Out About Drug Arrest

Speaking for the first time since her Dec. 18 arrest on charges of selling OxyContin, Sherry Johnston -- whose son, Levi fathered a son with Sarah Palin's daughter, Bristol, last month -- tells PEOPLE she got hooked on the prescription opiate after a hysterectomy eight years ago, which led to seven additional surgeries.

"I was in pain, and I'm still in pain," she says.

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