Pop singer Gwen Stefani might confidently strut her stuff on stage, but when it comes to parenting she still questions herself.

Even though the 42-year-old has her English rock star husband, Gavin McGregor Rossdale, to support as well as a full-time nanny, she still get 'overwhelmed' by the stress of raising her two sons, Kingston, 6, and Zuma, 4.

When she was asked how she managed to juggle motherhood with her career, she told British Elle magazine: "It's not possible. There are always days that somebody suffers. The only thing I really worry about is, again - I keep bringing it up because it's my biggest stress - how do I do this and that? How do I do both? So that's like the constant battle that I have every day. I do worry about that all the time."

Stefani began her fashion career shortly after her group "No Doubt" broke-up in 2004.

But she has had to miss work events to be home for her children's first days of school.

"I've missed the last couple of fashion weeks because of school," she said. "I can't leave the kids, I can't miss the first week of kindergarten. I just can't."

Stefani said balancing work and her role as mom can get pretty tricky.

"Being a mom is hard, I think a lot of working moms feel that way. [They want] to have time to be themselves as well but it's really hard, there's a price to pay."

The singer/fashion designer explained that as her children grow-up, she feels as if she has less of her own identity.

"When you first have a baby your life doesn't change. I mean, you have a little less sleep and you drag these cuddly things around you and it's just amazing. But you still get to be you. Once they get to, like, five, six and school and it starts to get, like, 'Wow, they got real problems. They're my responsibility...' Oh my God. That is overwhelming."

Stefani's marriage has gone through plenty of ups and downs. In 2004, she discovered Rossdale had a secret daughter, model Daisy Lowe.

He had had a five-year affair with her mother Pearl Lowe - who was married at the time - in the 1980s, before he met the pop star.

Last year, she said, "I've been with Gavin for 14 years, and, let's face it, that is a huge accomplishment. I feel so proud of that - it hasn't been the easiest journey."

Speaking to Elle magazine, Stefani explained that while she likes that her husband is now consistently at home, she claimed it also comes with its own set of challenges.

"He's home now for, like, seven days, so just him being home makes everything different. In a good way," she said. "But also in a hard way because it changes everything.'"

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Gwen Stefani