Lindsay Lohan to Ali: Party On, Sister!

Ali Lohan is 15. She's too young to drive, vote, purchase tobacco products and fight in a war.

But, relax, people. Lindsay Lohan says her sister is perfecetly capable of partying late into the night. This is coming from someone who certainly knows what it takes to do that.

"She's tougher than I am," Lindsay told Life & Style. "She has a good head on her shoulders. Maybe it was different for me because I didn't know what to expect and it just happened really fast. I didn't have a big sister."

That's true. Fortunately for Ali, she has a big sister that can teach her exactly how to snort cocaine, vomit from drinking and get behind the wheel of a car when it's wholly illegal and dangerous to try.

Lindsay added that Ali will "go home early" if her sister wants to stay out late.

It's a good thing, too. Ali Lohan is home-schooled. She can't sleep in and miss out on lessons from mother Dina that include: How to Pose for Tabloid Covers and Crotch Shots 101.