Remember when that Marine made a YouTube video inviting Mila Kunis to the Marine Corps Ball and she was like "Oh scheduling conflict, can't go" and Justin Timberlake was like, "You should go" so then another marine was like "Well, if you're pressuring Kunis to go to the ball, then you should come with me" and Justin Timberlake was like "Ok"? Anyways, that Marine Corps Ball was this past Saturday and Justin Timberlake was the date of Corporal Kelsey DeSantis. Timberlake says the entire evening was one that he would never forget and wrote on his website: "I didn't know...