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Sherry Johnston, shown here, was arrested on drug charges Thursday in Wasilla, Alaska. (AP Photo)

The mother of Levi Johnston, the Wasilla teenager who is the father of Alaska Gov. Sarah Palin's daughter's unborn child, was arrested Thursday on drug charges. 

The Anchorage Daily News reported Friday that Sherry L. Johnston, 42, was arrested by Alaska State Troopers at her Wasilla home and charged with six felony counts of misconduct involving a controlled substance. 

The arrest was the result of an "undercover narcotics investigation," according to police. 

Few details were available. Johnston was released on $5,000 bond, according to the paper. 

Johnston's son, Levi, drew headlines soon after John McCain named Palin to be his running mate at the end of August. The campaign announced in a press release that Palin's 17-year-old daughter Bristol was pregnant, and that Johnston, 18, was the father. The story became the soap-opera subplot to the Republican National Convention the next week. 

Levi Johnston and Bristol Palin have said they intend to marry in the summer. Their baby is due Saturday, according to the Anchorage Daily News. 

Click here to read the full story in the Anchorage Daily News.