Fashion Clothing Plunging Necklines By InStyle Editors InStyle Editors Facebook Instagram Twitter Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. InStyle's editorial guidelines Updated on April 6, 2015 @ 10:58AM Pin Share Tweet Email Trending Videos Photo: Michael Buckner/Getty Plunging Necklines 01 of 04 Sienna Miller Sara De Boer/Retna Sienna Miller in vintage Ossie Clark 02 of 04 Ali Larter Stephen Shugerman/Getty Ali Larter in Ports 1961 03 of 04 Mary-Kate Olsen Jeff Kravitz/FilmMagic Mary-Kate Olsen 04 of 04 Felicity Huffman Michael Buckner/Getty Felicity Huffman wearing Dina Bar-El