Ashley Kaufmann May Be Lindsay Lohan's Long-Lost Sister

Ashley Kaufmann may be Lindsay Lohan's long-lost sister, according to reports Tuesday.

InTouch Magazine is claiming that Michael Lohan, the father of Lindsay and Ali Lohan, may have fathered Ashley Kaufmann during a brief split from wife Dina Lohan thirteen years ago.

DNA tests are reportedly being done to prove paternity.

Michael Lohan admitted last week that he had a month-long relationship with Kristi Kaufmann, a 44-year old Montana massage therapist, while he was separated from his wife Dina in 1994.

Kristi spoke to OK Magazine, saying that she planned on having a paternity test years ago in privacy to protect the other Lohan kids.

Kaufmann said she met Lohan at dinner with a mutual friend in the 1980's. Years later, the two met up again in 1994 and began an affair. "It went on for about four weeks," she says. "He told me he was separated from Dina. He told me about Lindsay's Jell-O commercial. He took me to meet his parents. We were in love."

A few weeks after their affair ended, Kristi discovered she was pregnant and tracked him down and told him about the baby, but he then disappeared. Over the years, she said she tried to get in touch with him and finally received a phone call while he was in jail where Kristi says Michael finally admitted, "I always knew she was mine."

Lindsay Lohan is reportedly taking the news of potentially having a long-lost sister hard, while Michael reportedly said that he will sue Kaufmann if it is determined that he is not Ashley's biological father.