I love reading about the favorite beauty products of It Girls, especially when they dish about the singular product that defines their look. For Alexa Chung, that product is eyeliner. Famous for always sporting a cat eye, Ms. Chung notes that she used to use gel liner but ditched it in favor of the felt-tipped pen. I, too, did the same years ago. There was a point in my life when I swore by Bobbi Brown’s Long-Wear Gel Eyeliner... and then I discovered YSL's Eyeliner Effet Faux Cils. Pure magic. When I ran out of my first tube, I took a chance on a drug store variety in a suspicially similar container and I liked it just the same - in fact, I'm wearing it right now. If you're in the market for some great eyeliner, check out L'oreal Paris' Lineur Intense liner in Carbon Black. C'est Fantastique!