Stefani, 45, said that the biggest surprise in her career was that she even has a career as she was just a normal girl in a music band, reported E!Online.
"I was just this girl from Orange County who was in a band with my friends. Then they kept letting me do more and more and more. The biggest surprise in my career is that I have a career," she said.
The singer recently collaborated with MasterCard for their Priceless Surprises campaign.