The video shows her arriving at 11pm and skulking round the toilets before creeping inside a cubicle. Wedged inside the loo with two friends, Lohan pulls a small bag of white powder from her jeans pocket. She dips her finger in and shoves the substance up one friend's nose before snorting some up her own. This was filmed just 20 days after she proudly emerged from therapy.

It is claimed Lindsay has snorted 20 lines in one night alone. Her friend said: "That night I saw her do more than 20 big lines of cocaine. She was still up doing drugs at 11am even though she had started about 8pm the night before.

"In an average night Lindsay will do two and half grams of coke on her own. She doesn't buy it—she is given it by friends and acquaintances, and it turns her into an angry monster. I have watched many a time Lindsay treating her staff like cr*p."

Lindsay also likes the attention on her when she is high. The claims she tries to be the center of attention by stripping down, "When she is on coke, which is most of the time, all the attention has to be on her. I have lost count of the number of times I have watched as she stripped naked in front of everyone. Then she loves to check herself out in the mirror as she parades around with her boobs hanging out. One night we had gone back to her place and, as always, as soon as she walked through the door she stripped down to her thong, bent down and snorted cocaine off her coffee table and then off her toilet seat."

Lindsay often brags of wild sex sessions with a host of celebrities including singer James Blunt and model Calum Best. The insider revealed that Lindsay bragged, "I'm going to New York tomorrow to f*** Jude Law." the night she was caught snorting caught on tape.