May 16, 2013 10:48 am Cat Deeley's 10th “Dance” Season Cat Deeley chats about what makes the show great, Season 4 runner-up Stephen “tWitch” Boss being a guest judge, and how contestants have stepped up their acts. US & World Videos 1:36 WATCH: Some of the most talked about looks at the Met Gala 3:18 Cup of water leads to OC marathon disqualification 2:14 Kate Beckinsale returns to red carpet after hospitalization for mysterious illness 3:15 NSC reviewing cease-fire proposal: ‘I don't know that it gets any more sensitive than it is right now' 2:23 Climate change is moving Tornado Alley and driving more tornado outbreaks