Lindsay Lohan: 'Mean Girls' Actress Partying at Karaoke Bar?

Lindsay Lohan was partying into the early hours with her drunken friends, Page Six reported Wednesday.

The 27-year-old Mean Girls actress was spotted last Monday at Sing Sing Karaoke bar with some female friends in Avenue A in the East Village. Apparanly, she began to argue with a few of her girlfriends and stayed at the bar until 6 a.m.

"Lindsay was chain-smoking," the source said. "She walked in sober and she left looking tired."

The tipster added that Lohan was acting belligerent the entire time and caused a disturbance. Lohan then called the cops and accused the bar of holding her against her will while staffers complained that the private room had been trashed. A police report was not filed but Lohan's father, Michael, dismissed the concerns for his daughter's well being. It was only this past summer that Lohan completed a court ordered stay in rehab. She has admitted to being an alcoholic.

"She's absolutely fine," Lohan's father, Michael, tells Confidenti@l. "She's always great, she's up early every day and I'm happy that she's sober."

The elder Lohan placed the burden of responsibility on those closest to his daughter. He said her friends needed to act better in her presence.

"If they care about her, they won't drink in front of her," he said.