By peoplestaff225
Updated October 05, 2009 11:00 AM
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Celebrating her 40th birthday on Saturday, Gwen Stefani waved to fans and paparazzi gathered outside Cecconi’s in Hollywood, Calif. The No Doubt frontwoman was joined by husband Gavin Rossdale, their two children – Kingston, 3, and Zuma, 13 months – her family, bandmates and an intimate group of friends, including Kate Beckinsale.

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The celebration took place in the restaurant’s romantic and private Butterfly Room, which features a $1 million heart shaped Damien Hirst painting and a crystal chandelier. “The Butterfly Room was specially decorated for Gwen’s celebration with happy birthday balloons and roses,” says a restaurant source.

The group enjoyed a family style lunch with several appetizers, pasta dishes, salad, champagne and wine.

“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,” says the source. “Gwen and Kate seem very close and the girls shared a long chat and many laughs. Gavin and a nanny took care of the boys so Gwen could just relax and enjoy her celebration.”

After a long Italian feast, Gwen was surprised with a big birthday cake decorated with candles and sparklers. “With her oldest son helping her to blow out the candles, Gwen made a wish and she looked very happy,” the source adds.

— Pernilla Cedenheim

A second photo of Gavin and Kingston is below!

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Kingston wears sneakers by Creative Rec ($60).