London, July 24 - Singer Gwen Stefani showed off her toned abs at a concert in Los Angeles just 11 months after giving birth to her second son with husband rocker Gavin Rossdale.

Stefani, who will turn 40 in October, showed off her impressive figure at a performance with her group No Doubt. She wore a pair of baggy flight pants, knee-high boots and a tiny cropped top, reports dailymail.co.uk.

Stefani has a three-year-old son Kingston James and she gave birth to Zuma Nesta Rock 11 months ago. Apparently both her sons are caesarean babies, but there was no visible scar on her abdomen.