Very few high street retailers and luxury designers do not include a famous face in a new season collection.  As H&M announced their latest celebrity face to endorse their collection would be American songstress Lana Del Rey, the power of celebrity endorsement has once again proven its hold on the fashion industry. Since Madonna appeared as the first celebrity on the cover of Vogue, fashion PR teams have relied on the power of celebrity endorsement to connect with and sell to the general…