Callista Gingrich, the U.S. Ambassador to Switzerland and Liechtenstein and wife to former Republican House Speaker Newt Gingrich, is attracting attention for her super stiff hairstyle after a video showing her shaking President Donald Trump's hand went viral.Ahead of his trip to the G7 summit in Evian-les-Bains, France, earlier this week, Trump briefly greeted Gingrich before departing. The video showed that the wind was blowing considerably at…