Dubbed a "Sunday of Fun," the event took place at Stefani's Beverly Hills abode on Sunday afternoon and, in the singer's own words, was aimed at the whole family.
"Getting ready for Michelle Obama to come for a playdate," Stefani tweeted ahead of the affair.
To that effect, the festivities included face painting and balloon animals for the kids, along with celebrity guests like Alyson Hannigan, Nicole Richie, Jeffrey Tambor and No Doubt member Tony Kanal. There they listened to the first lady ask for their support for another four years.
"Barack can't do it alone. He's not Spider-Man. He's not a superhero. He's a human, so we need your help," Obama said. "I am not just talking to the adults here today. I am talking to the young people here as well. All of our young people—you might not be old enough to vote. You vote at school, I know—I met several young people who are going to be voting for my husband who are 10 and under—we accept those votes. But you can play an important role in this election, too. I want you to feel empowered."
Tickets for the reception started at $2,500 for a family of four, per the Hollywood Reporter.
One person who was MIA was Stefani's hubby, Bush frontman Gavin Rossdale, though their two children, 6-year-old Kingston and 3-year-old Zuma, were on hand for the fun.