Jon Hamm and Jennifer Westfeldt
05/23/2011 AT 05:00 PM EDT
and his girlfriend Jennifer Westfeldt
gave each other fashion advice at the Solstice Sunglass Boutique in Cannes
, where they were trying on shades beachside. Jennifer ended up picking a '50s-style cat-eye design from Kate Spade that Jon recommended. As she modeled the final selection, he gave his approval.