August 9, 2017 12:16 am ‘Tonight': Derek Hough Reveals ‘World of Dance' Winners Les Twins Derek Hough joins Jimmy Fallon to introduce the “World of Dance” winners Les Twins before their “Tonight Show” performance. US & World Videos 0:40 Watch: Police dog tracks and finds missing 85-year-old woman in Colorado 2:25 Boy Scouts of America changing name to be more inclusive 2:19 11-year-old celebrates teachers with appreciation snack cart 1:19 Met Gala 2024 after party looks: Cardi B, Lana Del Rey, EmRata 6:22 Craig Melvin compares ‘TODAY' crew to NASCAR