According to refinery29.com :

We’re 1,000% sure Stefano and Domenico’s choice will sell boatloads of bottles — and potentially stop traffic. Ms. Casta’s been a familiar face on the super circuit for years, but hasn’t achieved as much mainstream popularity here in the States as, say, contemporary Gisele Bündchen. That said, we’ve always been Casta addicts, and we’re betting her latest campaign will convert a new generation of modelizers.

Laetitia Casta has just been named the new face of Dolce & Gabbana Pour Femme