Meanwhile, it appears Lohan and ex-girlfriend Samantha Ronson may be getting back together. The two were spotted catching a flight from London's Heathrow Airport to Los Angeles Monday. Lohan was also seen wearing a diamond ring on her left hand.
A reconciliation could bode well for Lohan. Since confirming her split from her DJ girlfriend in April, the actress' well-being seems to have taken a turn for the worse.
In early April, she told Us Weekly magazine she was in "absolute hell" without Ronson. She then opened up about the breakup to Ellen DeGeneres, saying, "I had no idea what was going on. I just hadn't seen her in like a week. She like disappeared."
Lohan also told DeGeneres that she and Ronson, 31, "are friends" who continue to talk. Her father confirmed last week that the two are still in contact, though he couldn't elaborate on the current status of their relationship.
Lohan also seems to have shed a significant amount of weight in recent months. She flashed a shocking amount of skin and bone while shopping in Los Angeles in April, wearing a halter-cut dress that highlighted the caverns of her shrinking frame. People magazine reported that Lohan's friends and family see her weight loss as a cry for help.
She wasn't always so skinny -- Lohan appeared healthy, happy and at home with her curves in her breakout role in 2004's "Mean Girls." But she seemed markedly thinner at the time of her 2007 DUI arrest, and she appeared to be even thinner last fall.
Her father sees her apparent weight loss as further evidence that she needs help. After getting sidetracked by accusations that he threatened his girlfriend, a matter that he called "twisted" and said is being resolved, Michael Lohan plans to check up on Lohan in Los Angeles this week.
"I think she's stopped eating," he said. "[But] I'm not going to drag her anywhere. No one can. That's the way she is. Lindsay does what she wants."
The Associated Press contributed to this report.