September 19, 2017 4:16 am ‘Tonight': Best Friend Challenge With Demi Lovato Jimmy Fallon and Demi Lovato take turns asking questions about each other and guessing the answers. US & World Videos 0:37 Ex-Abercrombie CEO arrested on sex trafficking-related charges 9:07 Selena Gomez and Benny Blanco's sweetest moments 2:13 Real-life ‘Karate Kid' meets his inspiration 2:12 What to expect in court as Trump faces 2020 election charges in DC 0:54 Parents can start helping teenagers to build a financial foundation at home without spending