The biography would focus on the troubled actress' arrests, drug abuse, acting career and family, the celebrity gossip website said.
Sources familiar with the situation told TMZ the book began as a series of journal entries Lohan wrote while in rehab as part of a therapeutic exercise. The entries don't have a clear focus, but the actress said she's interested in opening up about her life.
Lohan met with literary agent Waxman Leavall Thursday in New York City, a meeting that was filmed as part of a docu-series about the actress on OWN.
Notable deaths of 2014 [PHOTOS]
Polly Bergen, Emmy Award-winning actress, dies