It wouldn’t be Fashion Week in New York without lots of celebrity sightings and the requisite photo ops. Rihanna is a definite fashion week favorite. This week she has mostly gone for chic, understated looks. Jada Pinkett Smith arrived at Christian Siriano with her gorgeous mother, who was mistaken for her sister by many a fashion journalist. And as usual, the “It” girls Kimberly Chandler, Shala Monroque, Hannah Bronfman and much, much more are killing it at front rows and fashion parties all over town.