Lindsay Lohan Should Be Happy About Another Sis

Instead of rejoicing, Lindsay Lohan is bitching:

Lindsay Lohan took to her MySpace celebrity blog this week to say she has a half-sibling fathered by her dad, and she’s not happy about it. But her father strongly denies the claim.

“My father just let my family and [me] know, amongst other [things] that he had another child after my little sister Aliana,” Lohan, 22, wrote Wednesday in a post titled “Random Thoughts.”

She continued: “Or maybe he had it before Aliana?? Either way, he cheated on my mother and that really sucks.”