Blair enjoys an evening in New York with her 3-month-old son Arthur. Plus: Kristin Cavallari, Robert Pattinson, Taylor Swift and more

KRISTIN CAVALLARI'S DRESS

Where can I buy Kristin's backless dress from the Star Track, "Back in Action"? – Lesley L.
The DWTS castoff gets the last laugh in a $286 "Carrie" dress by Boulee.