Lindsay Lohan was reportedly a "total nightmare" on the set of Glee.The troubled actress turned up late on set and is believed to have not prepared for the role when she arrived to play a part on the musical TV show.

"Lindsay was a total nightmare yesterday (August 25). She was three hours late in the morning and when she did finally arrive, she just didn't want to be there. She did not want to work. She did not memorize her lines and she kept disappearing so no one could find her," a source told E! News.

Lindsay filmed the first part of her role in the show - which is set to air on May 15 - last week, but the follow-up shots was not as successful. Lindsay spokesperson Steve Honig, however, claimed it was a "misunderstanding," which made her let for her call:

"The production team came to us and said that they wanted to start [with Lindsay] right after lunch, which was at 2. They wanted to begin with Lindsay at 3, so that meant she had a lot of time where she wasn't doing anything. That's why people didn't see her. She was then in hair and makeup and began after lunch at 3. If there was a problem yesterday, I would have just said 'no comment,' however I can't ignore this because this is utter B.S. This is a classic example of people trying to bash Lindsay. She busted her ass yesterday and is back on set again today."