Lohan, star of "Mean Girls" and "The Parent Trap," is undergoing court-ordered treatment for alcohol and drug addiction at a California rehabilitation facility following probation violations for a 2007 driving under the influence conviction.
Screenwriter Charles Casillo recently told the New York Post Hearst-Shaw, a socialite and model, would play a Lohan-like "bratty movie goddess in and out of rehab."
However, Hearst-Shaw is denying she's attached to star in the film called "Dogs in Pocketbooks."
"Just so we are all clear, my hair is red because I am the new face of Schwarzkopf color," UsMagazine.com reported Thursday Hearst-Shaw said via Twitter. "I am a model. I dyed my hair to front the campaign."
"As for any theatrical roles I am currently filming Two Jacks directed by Bernard Rose. My next project is Catwalk by Tony Hickox," Hearst-Shaw added. "Thank you all for your messages of encouragement during my transition into acting. I truly love and appreciate it. At this time I am not officially signed onto any other projects. Thank you."