Meghan Markle and Prince Harry taking on the tabloids. And, new trouble for a "Clueless" star after her arrest.

Plus, Katy Perry's surprising "American Idol" revelations. Then, our "Seal Team" exclusive behind the scenes of the intense new season.

And, Robin Thicke is our special guest co-host. Can he help us guess our ET "Masked Singers."

Entertainment Begins and Ends with ET.