March 17, 2010 11:00 AM

Courtesy InStyle

Calling motherhood “the hardest thing” she has ever done, Gwen Stefani has a decision to make — whether or not to try for a third child with husband Gavin Rossdale.

“I don’t know,” the 40-year-old No Doubt frontwoman and L.A.M.B. designer laments in the April issue of InStyle. “No one could have prepared me for how awesome it is, and how hard.”

Noting that sons Kingston James McGregor, 3 ½, and Zuma Nesta Rock, 18 months, have “a lot of energy,” Stefani admits that “it does seem weird” she hasn’t yet welcomed a baby girl, given her flair for fashion.

However, she’s also cognizant of her biological clock, revealing that she often feels as though she is “running out of time.”

Yet there are equally compelling reasons to stop at two. “I … don’t want to spread myself so thin that I can’t even be good for them,” Stefani muses before adding, “Poor Zuma, he’d be the middle guy.” She adds,

“I’m not focusing on it right now, but it’s not up to me anyway, you know? These things are miracles, so we’ll see.”

If her family does stay the same, Stefani quips that it is her sons’ future girlfriends who will benefit the most by inheriting her famous wardrobe. Kingston is showing early signs of fashion icon status himself, however, and Gwen says it’s his own doing.

“At that age they like to be in control of everything, so I let him choose,” she explains. “Luckily, everything in his closet is cute so no matter what he picks, he’s gonna look good. For a while he was into costumes. Now he doesn’t even want to wear shoes.”

Describing Kingston as a “little punk” who is nicknamed “Sid,” after the late Sex Pistols bassist Sid Vicious, Stefani says the boys have little in common beyond their parentage.

“It’s crazy how the second child is so different from the first, and has the same parents. They are totally different, and they look totally different,” she observes, noting that Kingston is a “head to toe” mini-Gavin while Zuma favors Stefani and her father Dennis.

Her second son is also “more of a show-off” than Kingston, Stefani says. “[Zuma] wants everyone to watch him, and he’s a goofball and he’s really silly. He’s a funny guy.”

The family split their time between Stefani’s native Southern California and Rossdale’s native London. While it’s hard to be away from her extended family, she says that the UK offers a distinct advantage as far as the boys are concerned.

“I take Kingston to the gym with me, with no nanny or assistant, and that would be very rare in L.A. — that I could actually go somewhere on my own,” notes Stefani. “Things can get out of hand with the paparazzi, and I don’t feel safe.”

All those days spent across the pond has brought about another perk, albeit a humorous one. When asked whether Kingston and Zuma have developed British accents, Stefani points out that children are “like little sponges.”

“Once in a while, Kingston will pick up a word, like, ‘I’m going to have a bahhth.’ And I’m like, really? A bahhth!”

Having recently wrapped a 60-concert tour with No Doubt, Stefani says the experience was emotional on a multitude of levels. Not only was she back on stage with her band after a prolonged hiatus, the singer/songwriter realized that her life had come full circle since she wrote most of the lyrics.

“I had tears in my eyes when I was singing certain songs,” she admits. “Like, ‘Simple Kind of Life’ … where I say, ‘I always thought, I’d be a mom.’ And all of a sudden I am, and my kids are sitting on the side of the stage watching me sing. It was really intense.”

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