Now Playing: Paramore on Dedicated Fans: 'It Makes All the Difference'

Now Playing: Miley Cyrus Is Coming to 'GMA'

Now Playing: Javicia Leslie makes history as first Black ‘Batwoman’

Now Playing: Why Don't We performs 'Slow Down' on 'GMA'

Now Playing: Selena Gomez releases surprise song and music video overnight

Now Playing: Woman builds Iron Man suit from scratch

Now Playing: Jeff Bridges reveals his tumor has ‘drastically shrunk’

Now Playing: Armie Hammer pulls out of film after alleged leaked messages

Now Playing: Siegfried Fischbacher of Siegfried and Roy fame dies at 81

Now Playing: Tom Brady, Drew Brees set to face off in NFL playoff game

Now Playing: Celebrating Siegfried

Now Playing: Remembering Joanne Rogers

Now Playing: Legendary Las Vegas entertainer dies of pancreatic cancer

Now Playing: Joanne Rogers, widow of Mister Rogers, dies at 92

Now Playing: You can’t say the title of London Hughes’ new comedy special on TV

Now Playing: New book reveals dangers of the dog food industry

Now Playing: Rob Lowe discusses playing front-line hero on '9-1-1: Lone Star' amid pandemic

Now Playing: Hunter Hayes performs ‘The One That Got Away’

Now Playing: Patrick Dempsey talks ‘Grey’s Anatomy,’ ‘Disenchanted’ and new passion project

Now Playing: How to make Kristin Cavallari’s white chicken chili