The star wedding no one saw coming. What really happened in Vegas? Only we're with the celebrity impersonator who performed the surprise ceremony. Plus, controversy hits the "Billboard Music Awards." The performance that has some angry fans calling out a pop star. Then, "The Big Bang Theory" cast say a final goodbye. Is another spinoff joining "Young Sheldon?" And, a "Royal" secret? Has Meghan and Harry already welcomed their baby? Entertainment Begins and Ends with ET.