Michael Lohan dropped a bomb on his family – he has a secret love child. Michael claims the girl, now 13, was conceived when he and now ex-wife Dina were separated, thus implying that he wasn’t cheating on her. This is the first I’ve heard of an earlier separation. Michael’s definitely not talking about the separation that eventually led to divorce – he and Dina have 14-year-old daughter Ali and 12-year-old son Cody.

Linds’ father, Michael Lohan, has admitted to OK! that, while married — but at the time separated — to now-ex-wife Dina Lohan, he had a relationship with another woman which resulted in a pregnancy. In a statement to OK!, Michael says, “Years later [the woman] contacted me, convincing me that I was the only person she was with and that she had my child.”

In fact, OK! has seen letters Michael wrote to the girl’s mother where he says that his secret daughter “is beginning to look a lot like Linds, with a mix of [younger brother] Cody, believe it or not.” He also sent his daughter a photograph of himself while he was still in Collins Correctional Facility which he signed “Love Daddy.”

Michael’s secret daughter has had many conversations with her dad, the girl’s mother tells OK!. He even called her for her 13th birthday on June 12. But he has never visited her or provided financial support. “It’s time for Michael to take responsibility,” the girl’s mother tells OK!

[From OK! Magazine]

Can you imagine finding out that Lindsay Lohan is your sister? I would throw up so hard. This poor girl has obviously known for a little while, since Michael got out of prison a little over a year ago. Though he never specifies how long ago the girls’ mother contacted him, so who knows how long this girl has had to grow up knowing she’s genetically linked to the Lohan clan.

I have to wonder if the other Lohan children were informed before Michael dialed up OK! You’d think Dina would have used it against him publicly by now, had she known. So I’m guessing this is brand new information for most of them. I can only imagine what the first family picnic will look like. I imagine it’ll involve fried chicken, alcohol, and tears.

Here’s Lindsay Lohan on the set of her upcoming new film ‘Labor Pains’ in Los Angeles yesterday. Images thanks to WENN.