Lindsay Lohan isn't winning many friends in Hollywood after she was overheard telling friends what she thought about her acting peers. The Mean Girls actress became a real-life mean girl when she reportedly picked on Scarlett Johansson, Sienna Miller, Keira Knightley and Jessica Simpson at a party.

America's National Enquirer claims Lohan called Johansson "ugly" and "fat," Simpson "dumb" and Miller a "no-talent crackhead".

And, after insisting to all who cared to listen that she was "the greatest actress in the world," a source tells the publication Lohan then turned on Knightley, calling her a "flat, shallow, cardboard cut-out of an actress".

Ironically, Lohan was slated to appear alongside Knightley in new Dylan Thomas biopic The Edge Of Love but pulled out of the project, leaving Miller to take her role.

-Lindsay Lohan Pictures

(This news article provided by World Entertainment News Network)