London: Singer Gwen Stefani, 41, admits she was unable to write new music after giving birth to her second son, Zuma in August 2008, as she felt unhappy with her body.

“I hadn't planned on doing a tour; I'd had Zuma, I felt so gross - I got so big and felt so out of touch and not cool. I was trying to write this cool record and nothing came out,” said Stefani.

Stefani, who has another son Kingston, with her husband Gavin Rossdale, found going back on stage tough.

“We hadn't been on stage together for five years and every night I'd get teary-eyed because of those old songs. I'm up on stage and I'm singing songs about relationships. I'm looking over my kids. It's very surreal,” she said.