Oprah Winfrey opens up about motherhood in a revealing new documentary and ET's Kevin Frazier reports the touching story. And, Jay Leno gets real on the "late night wars." Wait until you hear why he hasn't spoken to David Letterman in years. Plus, a new "This Is Us" shocker. Milo Ventimiglia's TV brother sounds off on the show's big twist. Then, we're with Robin Thicke before "The Masked Singer" star is unmasked! Then, "Tidy Up" star Marie Kondo shares her life changing cleaning tips with ET. And, ET's "Good Works" joins Joe Manganiello for a surprise visit to ?Pittsburgh?s Children?s Hospital.? Entertainment Begins and Ends with ET!