Oh, no! Lindsay Lohan has ANOTHER sister?

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Just what the world needs. Another Lohan.

Seems that Lindsay Lohan's father, Michael Lohan, had a daughter with another woman while he was still married to Dina Lohan more than 13 years ago. He says he was estranged from Dina, Lindsay's mother,  at the time.

Yup, he's using that old "We were on a break" excuse.

Michael Lohan told OK! Magazine, "Years later the woman contacted me, convincing me that I was the only person she was with and that she had my child."

Michael – married to Dina from 1985 to 2007 – has written letters to the girl's mother saying his illegitimate daughter "is beginning to look a lot like Linds, with a mix of Cody, believe it or not."

He also sent a photo of himself to the girl, which he signed "Love Daddy."

The girl's mom claims that while Michael called his daughter on her 13th birthday in June and has spoken with her on the phone, he's never visited or sent money.

We're shocked, simply shocked!

She told OK: "It's time for Michael to take responsibility."

She might do better by trying to land her daughter a role in Dina Lohan's reality TV show, "Living Lohan." It would have to make the show more interesting. And I'm sure your daughter is more appealing than her snooty-faced, spoiled half-sis, Ali Lohan.

Click HERE to see how Lindsay feels about her new sibling. Two words. Ending with "Off!"

Photo: Move over, Ali, Lindsay, Cody and Michael Lohan. You've got a another sister!
WireImage

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