The newspaper reports that she's taking lessons from Sheila Kelly, developer of the aerobics striptease workout, for the film "I Know Who Killed Me," in which she takes on the role of topless dancer.
The newspaper says Lohan sent an e-mail to friends last week, titled: "They're all whores, they're all whores . . . xcept for some obviously!"
"I mean really though, really, I didn't know it was actually possible to have bruises in such areas of the body. Strippers dude, I tell you, I really respect the (c-word)s now. . . I'm not gonna lie to ya," Lohan writes.
"Her character is a stripper, and she now realizes that the job isn't easy. We should give these women credit," Lohan's rep told the Post.
Lohan has been going to clubs while shooting the movie, but hasn't been drinking, the newspaper reports.
"When the shoot is over, she is going to focus her attention 100 percent on staying sober and building a more fruitful life," a source told the newspaper. She is considering moving back to New York and leaving behind "the toxic L.A. scene with all those toxic people."