Caught in the Act

Hilary & Haylie Duff Bond Over Babies

12/02/2011 at 05:55 AM EST

Hilary Duff was joking with sister Haylie about bringing a baby boy into a family dominated by women. The sisters were hanging out at a party for stylist Jessica Paster's JustFabulous collection at a private house in the Hollywood Hills. Joining them for the sit-down dinner party (which was co-hosted by Emily Blunt): Duff's hubby, Mike Comrie. The evening also took on a holiday theme as guests swilled champagne and huddled around a Christmas tree, where Jessica gave out gifts from her new line. – Jessica Wedemeyer

NEXT: Jessica Alba Drinks Celery & Apple Juice for Lunch