Following the preview of the campaign that we brought you late last week. Here is a KARLISMYUNKLE exclusive new image of Rachel Bilson rocking a red wig behind the scenes in Paris at the Magnum by Karl Lagerfeld shoot.

rachel bilson reg wig magnum

One element of the campaign is an competition (about celebrating your favorite indulgences from fashion to ice cream) with Polyvore launching today judged by Rachel Bilson which allows the winner to attend the Magnum ice cream film premiere during the Tribeca Film Festival with Karl Lagerfeld and Rachel Bilson.

The contest will go live this afternoon on and the Magnum Facebook page.