Entertainment Tonight AIRED Tuesday 12.31.2019

Hollywood's "New Year, New You" staying young guide! Jennifer Aniston, Jennifer Lopez, Reese Witherspoon! The stars share their best tips for staying young. Could it work for you too? Plus, how Jessica Simpson lost an amazing 100-pounds and more incredible secrets behind stars weight loss transformations. Then, Kaley Cuoco "Harley Quinn" shares her insta-extreme beauty secret.