Francesco Risso will become creative director of the label.
The designer had most recently been freelancing after running his own label and working at Cerruti and Jack Wills.
The company reported a dip in its fiscal-year earnings, but an increase in full-year sales.
While beauty deals are coming at a rapid pace, financial sources said the market is showing no signs of slowing down.
The brand makes products specifically formulated for children.
The company is on track to ring up $150 million in revenues over the next 12 months, a 280 percent jump from the same period a year ago.
There was an improvement on the operating profit level but sales were basically flat. Meanwhile, the company cut its full-year targets as a strong yen cut into its international performance.