"When I first started this line, I thought it was going to be for under 5, but Target wanted me to do the bigger girls, which is a really strange age," she says. "They're so inspired by things they see, trying to find themselves, expressing themselves, they're influenced by friends, what they see on TV and the Internet. I thought it sounded like a big job but I've gotten into it."
The clothes, available in stores Monday, are a mix of the girlie frills and masculine silhouettes that Stefani says are staples of her own wardrobe.
And she's conscious of being age-appropriate.
"That part is challenging," she says, "but I think we've done a good job."
Yet, while tween girls are willingly to take style advice from Stefani, her boys have no problem saying "no," especially Kingston, who likes to pick his own outfits any chance he gets because he wears a uniform during school, she says.
Mommy still wins the wardrobe wars, occasionally, though.