Rick Schroder arrested twice? What we're learning about the latest trouble for the former child star. Plus, "Jeopardy!" host Alex Trebek gets candid about his health battle with Stage 4 pancreatic cancer. His message for fans. Then, more "Big Bang Theory" tears and memories as the iconic show films its final episode and the cast gets a special honor. And, ET is exclusively backstage with Carrie Underwood as she hits the road for her "Cry Pretty" tour. What surprises does she have in store? Entertainment Begins and Ends with ET.