Lindsay Lohan - has half sister 4 Christmas?!

Lindsay Lohan says that LiLo has a half sister on LiLo' MySpace blog. Her sister may be Ashley Kaufmann.

Lindsay Lohan' Dad has admitted a fling w/ the teenage girl’s 44-year-old Montana massage therapist mom, Kristi Kaufmann. It happened in 1995, when Lindsay' Dad was separated from Lindsay's mom, Dina Lohan.

Lindsay Lohan' Dad reportedly took a paternity test in July. Yeah, should be about time to get those results back ...

"My father just let my family and [me] know, amongst other [things] that he had another child after my little sister Aliana," LiLo writes in a post titled "Random Thoughts." "Or maybe he had it before Aliana?? Either way, he cheated on my mother and that really sucks."

But her dad strongly denies his daughter's claim to People. He also said there’s a "99 percent chance" Lindsay Lohan's MySpace message was actually written by her girlfriend, Samantha Ronson.

OMG.

:)