J.K. Rowling Was "Barely Hanging on By a Thread" During Harry Potter Mania

J.K. Rowling will open up to Oprah Winfrey on Friday about writing the best-selling Harry Potter books and revealing whether she'll ever visit Hogwarts again.

The 45-year-old, who's worth $1 billion, spoke to Oprah from her home in Edinburgh, Scotland, in a pre-recorded interview airing on Friday, confirms her U.S. publisher Scholastic Inc.

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The author speaks about coping with fame, pressure and she "shares her thoughts on the possibility of ever writing another Harry Potter book in the future," Scholastic said in a statement.

"You ask about the pressure," J.K. says to Oprah. "At that point, I kept saying to people, 'Yeah I'm coping...' but the truth was there were times when I was barely hanging on by a thread," she says.

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A two-part film adaptation of Harry Potter and the Deathly Hallows has been filmed, with part one slated for release in November.