Gwen Stefani has revealed that No Doubt's new album may take longer than expected.

The band are currently working on the follow-up to 2001's "Rock Steady", which as yet has no official release date.

"We've been doing a record all year; ten songs have been recorded," Stefani told the Wall Street Journal.

She added: "When this [new collection for fashion label L.A.M.B.] is done I'll probably write a few more songs. I don't know when it'll come out, but you never know what can happen."

"My band takes a weird process as well. It takes so long. And all of them just had babies, so it'll be a while."

Meanwhile, No Doubt announced they are planning to embark on a huge world tour in support of the new album.

Thanks for the report to Gigwise.com.