Lindsay Better Watch Her Back!

Or else her kid sister Ali is gonna start stealing her movie roles! E! Online reports that Linds' 14-year-old sibling is up for a part in High School Musical 3... opposite Zac Efron! And what will she be playing? "A spoiled little princess," says their source.

Something tells me this won't be much of a stretch for the Long Island native!

And if you think this is just a rumor, think again: A rep for Lohan confirms, "she is auditioning for it."

Can Ali even act? Hey, if Vanessa Hudgens can do it, so can she!