the little prince already sparking more than 2 million tweets since kate into labor. prince william's response? "we could not be happier." word came monday of the birth after at least ten hours of labor with william at kate's side. an 8-pound, 6-ounce boy, the prince of cambridge, name unknown, born at 4:24 p.m. local time. the couple waited four hours before telling the public in order to spend time with their new son. >> good morning. she's in labor. the duchess of cambridge heads to the hospital. >> on the hottest day in london