Entertainment Tonight aired FRIDAY, JANURARY 6, 2019

New developments in the "America?s Got Talent" investigation. Where we just found Julianne Hough and more from our exclusive interview with Sharon Osbourne. "Live from New York ?Its Jennifer Lopez!" From the new promos, inside the rehearsals and a superstar coach? Everything we know about this weekend?s "Saturday Night Live!" Plus, A "Jersey Shore" bombshell. Who?s retiring from the show after the 10-year Anniversary? Only ET is with Dolly Parton in Boston. Shania Twain talks about her Las Vegas residency. LL Cool J AND Chris O'Donnell share secrets from the "NCIS: Los Angeles" Christmas episode. Then, our special guest co-host is "The Marvelous Mrs. Maisel" star Marin Hinkle.