Ali Lohan seems to be following big sister Lindsay everywhere these days -- even into her closet. Ali stepped out wearing Lindsay's clothes on both May 4 and 6. "Ali is 15 going on 16 and dresses her age, so there are some outfits that just work," mom Dina Lohan tells Life & Style. "Ali looks up to her sister, as every younger sister does. Lindsay is very stylish -- a style icon." In fact, as Ali continues to embark on an entertainment and fashion career of her own, mom Dina says she's got the perfect teacher. "Lindsay is a good person to have watch over Ali right now," insists Dina. "Lindsay can show Ali the ropes. Ali's out there working on her record and singing career. She just did a photo shoot for a coffee table book that's coming out. She's got a lot of things going on. So it's good to have Lindsay around." And Lindsay doesn't appear to be distracting Ali from her schoolwork. "Ali is being home-schooled," says an insider, denying reports that the teen is a dropout. "And Lindsay doesn't take her 15-year-old sister to parties."

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