Duff Plans Second Novel

The singer/actress signed a deal to release her teen mystery tome Elixir earlier this year (10) and is currently on a book tour of the U.S. promoting her first literary work.

And after receiving great feedback from fans who have already devoured the story, Duff will sit down and begin writing her second title in a matter of weeks.

In a post on her Twitter.com page, she writes, "Can't believe so many people have read the book already! Yipeeee! Starting the next one in two weeks."

Elixir tells the tale of a photographer who uncovers the mystery of her father's disappearance.