The cosplayer of the Double Week is Crystal Graziano (Web | deviantArt | Twitter).
You can remember (I even can say, you must remember) her sweet Raiden cosplay and other MGS-related works. It you haven't ever heard about Crystal, here's some bio:
My name is Crystal Graziano, but I also go by the online handle "Precious." I live in Southern California with my husband Todd and my shiba inu Ginger. I am self taught in all of my skills, and I'm eager to learn more! I started cosplaying in 2005 at San Diego Comic Con, and I've been enjoying the hobby ever since. I do my best to accurately recreate the source material that I'm drawing from and make it look as real as possible. Thanks for looking, and I hope you enjoy what I've made!
More information about Crystal you can find on her website.