By Bronwyn Barnes
Updated Jun 03, 2011 @ 6:15 pm
Credit: Allen Berezovsky/WireImage

Making one of her first public appearances since becoming a mommy, Rachel Zoe spent her night out shopping! The star stylist-turned-designer and husband Rodger Berman hit Carolina Herrera's Los Angeles boutique for a book party to benefit women's charity Vital Voices. Janet Jackson stepped out in West Hollywood to help Saks Fifth Avenue fete designer Haider Ackermann, while mother-daughter duo Susan Sarandon and Eva Amurri toasted to the 200th anniversary of Perrier-Jouet champagne in New York City. Click through the gallery for more photos of stars at last night's hottest parties!