Kardashian and her 21-month-old son enjoy some mommy-and-me time in N.Y.C. Plus: Gwyneth Paltrow, Mary-Kate & Ashley Olsen, Pink & Willow and more

BAG IN ACTION

Reunited lovebirds Rachel Bilson and ex-fiancé Hayden Christensen indulge in some retail therapy Wednesday in N.Y.C.