Gisele Bundchen appears in the latest campaign for jewelry brand David Yurman, but her alleged baby bump doesn’t. The possibly pregnant model sports a flat belly in images unveiled at a cocktail party on the roof of Yurman’s TriBeCa offices Tuesday. Her abdomen is shown exposed as she frolics on a beach in a bikini and Yurman baubles. Guests included Carine Roitfeld, Tiki Barber, Nicole Trunfio, Jay Manuel, Raphael De Niro and Elle’s Roberta Myers.