Gwen Stefani is sharing the special moment she knew her wedding dress was the one. The 51-year-old singer married 45-year-old Blake Shelton over the July 4th weekend, and on Instagram on Monday, she gave her fans a glimpse into the sweet moment she chose her gorgeous Vera Wang wedding dress.Stefani shared footage of her beaming as she looked at herself in the lily white silk georgette and tulle gown with a plunging neckline.