The No Doubt singer - who has sons Kingston and Zuma with Gavin Rossdale - feels bad about leaving her children while she is touring and she admits she had concerns about rejoining the band after an 11-year-break.

She said: "[I was] getting to the studio and [worrying about] not being able to make it happen and missing out on being at home, missing out on putting the kids to bed. What`s more important? I felt so guilty.

"[I thought] I am letting everyone down in the studio right now, I`m letting down my kids; I`m letting down myself. Because time is so precious."

The 43-year-old star - who has been busy touring and recording the group`s new album `Push and Shove` - says she`s found it tough being a parent and she admits it has forced her to grow up.
She told US Vogue: "It`s super fun being a mum but it`s not what you think it`s going to be. And it`s really gradual.

"At first, your life is totally the same. You have this cute little thing that you get to drive around everywhere and it`s amazing. As they grow 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.
"When you have a family of your own it forces you to go into the adult world a little bit more."
sections: Celebrities