Fulfilling her ambassador duties, Naomi Watts acted as host on Wednesday at the Jacobs Creek Cool Harvest dinner in Sydney, Australia.

OK! GALLERY: NAOMI WATTS & HOLLYWOOD ROYALTY HONOR GRACE KELLY

The 43-year-old actress looked stunning in a black-and-white Stella McCartney dress as she posed for cameras. She reportedly mingled with friends and enjoyed jazz music while promoting the new Cool Harvest blend.

OK! NEWS: NAOMI WATTS REFLECTS ON HER BEAUTIFUL RELATIONSHIP WITH HEATH LEDGER

The dinner was held at Centennial Park, and it certainly made for a beautiful setting for the occasion. Although Naomi's husband, Liev Schreiber, didn't attend, her family did make the trip to Sydney with her. Hope it hasn't been all work for Naomi!