No wonder Paris Hilton has slept with so many guys.
TMZ has learned that the promiscuous heiress suffers from extreme Attention Deficit Disorder (ADD), making it difficult for her to focus on one gentleman caller at a time.
See, Stavros Niarchos? Told you it wasn't personal.
Reportedly, Hilton also has claustrophobia. This fear of confined spaces might also explain why she needs to be out on the town so often, while also leading to the sheriff's decision to spring Paris from Lynwood Jail last week.
Hilton is back inside the real prison now (not the type within which Katie Holmes suffers) and is taking Adderall for the ADD.
Although sources were not specific, Paris was not receiving all of her medications at Lynwood, helping to explain why she panicked more than Simon Monjack during a polygraph. Supposedly, there were times Hilton was so debilitated, she could not push the panic button in her cell.
For now, though, the lawbreaker is okay. She's sad and doesn't like jail too much, but reports say her lack of eating hasn't caused her to fall into dangerous Nicole Richie status just yet.