Lindsay Lohan has admitted she was "a bit irresponsible" on the set of new movie Georgia Rule last year after she was publicly chastised by the film's producer and her co-stars for her behavior. Last July, James G. Robinson, CEO of Morgan Creek Productions, wrote a strongly-worded letter to Lohan after a series of sick days and late arrival on set, threatening legal action if she continued to disrupt the picture.

The letter called her "discourteous, irresponsible and unprofessional" and went on to say her actions were those of a spoiled child which had caused her co-workers to feel alienated and "has endangered the quality of this picture."

In an interview with Allure magazine, Lohan admits she wasn't on her best behavior - but she was experiencing relationship problems with her now-ex-boyfriend Harry Morton, who ended their brief three month relationship last September

She says, "It upset me because I was... a bit irresponsible. I didn't think about the consequences, but I was also going through something in my life."

-Lindsay Lohan Pictures

(This news article provided by World Entertainment News Network)