Lohan, due to start jail time for probation violations, talked her way past security at the Hollywood Roosevelt Hotel for the party for DiCaprio's new movie J. Edgar.
“Lindsay was arguing with the security to let her in, dropping every celebrity’s name,' one onlooker said.
“Eventually they let her in, but she made everybody uncomfortable. She was aggressive and random, storming around.
'She tried to get to Leo, but he was surrounded by his security and a posse of his friends.
“Clint Eastwood, Leo and Dustin Lance Black were talking, and Lindsay sent one of her aides over, demanding to get a photo with them, but security shooed them away.'