Lindsay Lohan's Secret Sister?

(andPOP) - As if the Lohan family did not cause enough drama already, it seems that Lindsay Lohan may have a sister that she did not know existed.

According to E! News, there are reports that Lohan’s dad Michael fathered a girl with another woman while he was separated from ex-wife Dina Lohan.

In an interview with E! News, Michael Lohan admitted he had a relationship with a woman named Kristi, whom he met in Houston. He continued to say that the couple rekindled their relationship in 1995, when his relationship with his ex-wife Dina was on the rocks.

“I haven't seen [the woman] for 13 years. I believed her at first but now, out of nowhere, she's gone public. This is a woman with a lot of issues, I don't know if I can trust her,” says father Lohan. “My lawyers are working on this. There's going to be a paternity test.”

Apparently, Michael Lohan has never physically met his illegitimate daughter, but that he has spoken to her on the phone on several occasions.