According to the New York Post, Lohan was seen drinking Thursday in a New York club, where she was partying with her boyfriend, Calum Best. Friends of the star are angry to see her drinking again.
After spending the evening in the nightclubs Anchor Bar and Sway, the young actress took a private plane back to Los Angeles.
Lohan, who starred in the films Bobby and Mean Girls, underwent treatment at a rehabilitation clinic. A spokesperson for the actress has not made a comment on the news.