Gwen Stefani is wearing a very sleek medium length hair style that features eyebrow length bangs curled under.  To create this style on your own, apply styling product all over the hair.

Apply a straightening serum or gel and smooth through hair. Blow dry the hair straight using a round brush. Use the round brush with the hair dryer to make the bangs go under.

Shine serum and finishing spray is all that is needed to complete this simple, yet fashionable hair style.