Rossdale — who also shares sons Kingston, 15, Zuma, 13, with the pop star — kept his distance as he sat two rows behind the newly married couple and his former in-laws during the outside event.
Both Stefani — who rocked a bright red track suit as she sat next to her country crooner partner along with her parents — and the rocker snapped pictures from the stands of their son as they enjoyed the sunny Studio City, Calif. day.
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The former lead singer of No Doubt and Rossdale were married from 2002 until August of 2015 when the two announced that they were splitting after 13 years of marriage.
Stefani began a relationship with her fellow The Voice judge — who she wed in Oklahoma last July — later that year. The two got engaged in October of 2020.
Making a blended family work has been something that the "Just a Girl '' singer has been very vocal about. During an appearance on the TODAY show earlier this year she explained, "I think there was a lot to consider when you have so many people involved."
"Children, and their hearts, and everybody in my family [and] his family, we all went through a lot together," Stefani said following her engagement to Shelton. "So I think in a romantic way, when you fall in love so hard and so unexpectedly — and so late in your life — you think 'I want to marry you!' That's the first romantic reaction, like, 'Let's get married."