No Doubt frontwoman Gwen Stefani says being a mother is "super fun" before it starts getting "serious".

The singer-turned-fashion designer has two sons with Gavin Rossdale - Kingston, six, and Zuma, four.

Stefani says becoming a parent has impacted her life dramatically explaining to Vogue Magazine: “It’s super fun being a mom, but it’s not what you think it’s going to be… At first, your life is totally the same… And as they grow older, it really does start to change your life. Like, Oh, my God, they have school, they have to get through first grade, they have to learn to read.

She added: “It starts getting so serious, and you’re like, Aaaaaaah!”

Stefani says becoming a mother to two boys forced her to become more of an adult, as her time in pop punk band No Doubt allowed her to stay young and carefree for years.

She said: “I’ve never had to grow up in a way. When you think about it, we were in college together, and then we made our first record, and then we just took off and stayed in this bubble. But then when you have a family of your own, it forces you to go into the adult world a little bit more.”