Stefani, who turned 40 on Saturday (October 3), had her birthday bash at Cecconi’s Italian restaurant in Hollywood, reports People.
The singer was accompanied by her husband, Gavin Rossdale, their two children, Kingston and Zuma, as well as a small group of close friends, including Kate Beckinsale and her hubby, Len Wiseman.
A source at the eatery said, "Gwen looked amazing and so much younger than 40. She was in a great mood and seemed very excited to celebrate her birthday with her husband, children and friends."
Stefani got a head start on the festivities on Friday (October 2), when she and her husband enjoyed a stay at Hotel Oceana in Santa Monica.