R&B star John Legend will wed his model fiancee Chrissy Teigen this autumn (13). The leggy brunette has revealed she will wear a Vera Wang wedding dress to walk down the aisle, although she may need a little medical help to keep her nerves under control - because she relies on a daily dose of Xanax to get her through her day. She says, "I've got to be honest. I have such bad anxiety that sometimes I don't believe I've even taken the pill in the morning!" Teigen is keeping mum about the specific details of her big day, but she is willing to share the kind of dessert her guests will feast on. She tells the New York Daily News, "Lady M in NYC does the best crepe cake. It's amazing. Layers and layers of crepe drizzled in raspberry sauce." The model's wedding talk comes days after she slammed unsubstantiated rumours suggesting Legend cheated on her with another woman during a night out in the Big Apple. The singer proposed to the beauty in December, 2011.