Lindsay Lohan was allegedly thrown out of New York's Soho Grand hotel for arguing with apparent ex-lover Calum Best.
The 'Mean Girls' star, who recently returned from a romantic Bahamian holiday with Calum, threw a tantrum when Calum checked into the hotel with another woman.
A source told America's Star magazine: "Lindsay checked in with another guy, probably to try and make Calum jealous. She tried calling him but she couldn't get through."
The 20-year-old actress - who was treated for alcoholism in rehab earlier this year - then partied until 1.30am before collapsing in the hotel lobby.
A source said: "She was writhing on the floor and everyone could see that she wasn't wearing any panties. Her date and bodyguard looked horrified but they didn't do a thing to help her so the night manager carried her to her room."
Lindsay then allegedly kept phoning Calum's room and then went to bang on his door.
A source said: "He came to the door and opened it a bit, she peeked inside and saw the woman there. She went cuckoo. She yelled at him, slammed the door and banged on it some more."
The actress was reportedly escorted back to her room, but when her disruptive antics continued she was asked to leave the hotel at 5.30am. She checked out an hour later.