Gwen Stefani and Concert Fans Sing 'Happy Birthday' To Her 8-Year-Old Son Zuma

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Gwen Stefani's fans were on board to help celebrate her son, Zuma's, birthday!
Thousands of fans joined the 46-year-old pop star in singing "Happy Birthday" to 8-year-old Zuma during a tour stop in Austin, Texas on Tuesday.
"Would you guys sing happy birthday with us?" Stefani asked the cheering crowd as she hugged up to her middle child. Stefani’s eldest son, 10-year-old son Kingston, stood next to his mom and brother with a birthday cake in hand, while the candles were lit by a member of the "Go Ahead and Break My Heart" singer's stage crew.
Before fully launching into the birthday song, the mom of three ran to grab her 2-year-old son, Apollo Rossdale, for the adorable on-stage moment which a fan shared on Twitter.
The Voice coach has been hitting the road with her three sons in tow, but they're not the only special guests to join her on stage.
Watch Stefani's boyfriend, Blake Shelton, make a surprise appearance in the video below.