and finally she heads out to the stage. >> dua, dua, dua, dua, dua!s ritual. and then it's only her. and the people. ♪ tell me i have dreams but i'm the same me the same me ♪ ♪ inside dua lipa! >> reporter: dua lipa. authentic. unapologetic. on top of the world. >> i want to hear you! ♪ >> reporter: for "nightline," i'm zachary kiesch in chicago. >>> and next, a christmas greeting hgreet ing getting the royal treatment. we saved hundreds on our car insurance when we switched to geico. this is how it made me feel. it was like that feeling when you're mowing the lawn on a sunny day... ...and without even trying, you end up with one last strip that's exactly the width of your mower. when you're done, it looks so good you post a picture on social media. and it gets 127 likes. geico. fifteen minutes could save you fifteen percent or more on car insurance. fifteen minutes could save you how's your cough? i'm good. i took 12-hour mucinex and sent it far away. hey buddy, have you seen a nice woman with a cough? woahhh! mucinex dm releases fast and lasts 12-ho

. ♪ dua lipa's electricity.