Gwen Stefani's son Zuma wants to learn the guitar.

The four-year-old child - the younger brother to her other son, six-year-old Kingston - has been learning the instrument since he was young and likes to pretend he can play it with his mother's band No Doubt.

She said: ''Zuma's the one who's showing more interest in the guitar. Since he was tiny, he's always played guitar - well, he doesn't really play guitar, but he thinks he does.''

Gwen, who is married to Gavin Rossdale, admits having children is one of the reasons why she and her No Doubt bandmates - Tony Kanal, Tom Dumont and Adrian Young - have not recorded a new album in more than 10 years, and creating new LP 'Push and Shove' has been a challenge.

Speaking on the 'Ellen DeGeneres Show', she said: ''We'd get together three times a week and I tried all versions, like, 'Oh, today I'm gonna bring him with me,' and that didn't work.

''So then I was like, 'Today I'm not gonna see him. I'm gonna work all day, and then I'll be with him tomorrow.' It was just chaos. That's one of the reasons it took as long as it did.''