Robert Downey Jr., whose struggle with addiction has been well-documented, has agreed to write a memoir detailing his ups and downs.

Downey, 41, signed a deal with an imprint of HarperCollins to produce the book, which is due to hit shelves in 2008, the Associated Press reports. According to the publisher, the book promises a "candid look at the highs and lows of (Downey's) life and career."

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