Justin Timberlake Marine Corps Ball : Looks like they'd a ball -- or, as he tells it, the event "turned out to be probably the most moving evenings That i have ever had."Last summer, Justin Timberlake accepted a servicewoman's invitation to attend the Instructor Battalion Marine Corps Ball, and Saturday he made good on that promise."What I did not know was how moved I would be by the whole experience," Timberlake, 30, posted afterwards on his website.The singer-actor was combat instructor Kelsey De Santis's date to Saturday's dance at the Richmond Convention Center in Richmond, Va.Of times the two spent together, Timberlake wrote, "She seemed to me to become so humble and honest... Cool. She also simultaneously appeared like she was nervous about the whole evening and when I had been likely...