Lindsay Lohan's father says he's looking into a claim by a woman who says she had a daughter by him.

Michael Lohan said in a statement Friday that he once had a relationship with a woman named Kristy, though he hadn't seen her in 12 years. He said the two were seeing each other while he was separated from Dina Lohan.

"Years later she contacted me convincing me that I was the only person she was with and that she had my child," the statement said. "My lawyers will sort this out."

OK! magazine, for which Michael Lohan has written a blog, first reported the story. It said the girl is now 13.

Leslie Sloane-Zelnik, the publicist for Lindsay Lohan, didn't immediately return phone and e-mail messages from The Associated Press on Friday.