Kate Middleton battling cancer. ET’s in London as Kate makes her emotional announcement. Her plans for treatment and concerns for her children. Plus, what’s next for the royal family. Then, Tiffany Haddish’s court-ordered sobriety. The actress on her life changes after two DUI arrests. And, Celine Dion’s surprise appearance with her teenage twins. Is a music comeback next? Plus, headed back to “Yellowstone”? The cast tells us when a new episode could finally drop. Then, details on David Schwimmer’s TV return. And, a first look at Colin Farrell’s new series, “The Penguin”. Then, the new duo taking over Las Vegas. Cedric the Entertainer and Toni Braxton give ET a first look at their new residency. And, soap star, Sofia Pernas on finding love with “Tracker” star Justin Hartley. Plus, Kevin Bacon returns to the school where “Footloose” was filmed. His big surprise for the students. Then, a “Twins” sequel on the way? Danny Devito reveals plans for a new movie with Arnold Schwarzenegger. And, Gwyneth Paltrow shading her Marvel movie past?