Unstable Lindsay Lohan Slams Paris Hilton, Nicole Richie & Calum Best

A friend from Lindsay Lohan's inner circle has revealed the skinny star's mental state has continued to crumble behind the walls of the Promises clinic in California.

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"On the first night she couldn't stop crying. Since then she's refused to follow the rules and keeps having hissy fits about people," says source to News of the World UK .

Among the celebs she blasted were:

PARIS HILTON: "In one of her group meetings she yelled that her friend Paris was a coke whore and couldn't believe how stupid she'd been driving while banned. She said, ‘Paris thinks she's above everyone. She's not. Paris is a stupid cow and deserves what she gets'."

NICOLE RICHIE: Next she scathingly attacked actress Nicole. "She saw a woman who is bulimic and said, ‘She's like Nicole. What problems does Nicole have? The girl just needs to eat. Period'."

CALUM BEST: Our source said Lindsay was devastated after it was revealed her 25-year-old boyfriend had been caught enjoying a drug-fuelled romp with two hookers. Our source said: "Since then she has begun to self-destruct even more. When she was told what he had done with those prostitutes she broke down and cried, ‘I thought he loved me'.

"He still hasn't bothered to get in touch with her. She thought Calum might become her rock but sadly he has just continued his wild ways without her. That's torn her apart."