Happy birthday Gwen Stefani! The singer's wild style over the years (and a few surprises)

Not "just a girl": Singer, songwriter and designer Gwen Stefanihas proven she's a pop culture force to be reckoned with – and her fashion sense is no exception.

Since rising to fame in the 1990s with her band No Doubt, Gwen has launched a successful solo career, her L.A.M.B. fashion empireand found the time to settle down and have three children with husband, Gavin Rossdale.

She's also sported many different looks over the years. From Cali skater girl, to ska-punk reggae chick, to Harajuku ringleader, Gwen is a true fashion chameleon, though some things - like her enviable abs (seriously, how does she do it?) - never change.

To celebrate the singer's 45th birthday, we've rounded up some of Gwen Stefani's most iconic looks – and a couple you’ve probably never seen!

CLICK ON THE PHOTO FOR GALLERY

HELLO! Canada magazine is available for your tablet and smartphone. Get HELLO! Canada, PEOPLE, Vanity Fair and over 100 more of the world’s best magazines for one low monthly price at Texture by Next Issue. CLICK HERE to sign up for a free trial.