Stars like Mandy Moore, Jessica Biel and Hilary Duff already love Loeffler Randall’s cool-girl shoes, legendary boots and downtown clothing, and now it’s even easier to buy them! The N.Y.C. line launched its e-commerce site today. And not only will you get a hand-written thank you note with your purchase, but if you buy between now and Oct. 1, a portion of the proceeds will go to Living India, which serves HIV-positive children in India.