Now Playing: 'American Idol' top 24

Now Playing: 'American Idol' recap: Episode 2

Now Playing: Weekend Rewind: The Royal Wedding

Now Playing: Highlights: 'American Idol' finale, part 1

Now Playing: Why so fascinated with fascinators?

Now Playing: Will Doria walk her daughter down the aisle?

Now Playing: A 47-year mystery solved?

Now Playing: Royal wedding: final preparations

Now Playing: Trump: 'We're going to give you protection'

Now Playing: How to make Beef Wellington

Now Playing: Friday Rewind: Deadly Palestinian Protests

Now Playing: Insomniac Theater: 'Deadpool 2' and special royals' movie list

Now Playing: New York lawyer's viral racist rant

Now Playing: Royal wedding preview

Now Playing: Giuliani: Mueller cannot indict the president

Now Playing: The fundamentals of royal wedding etiquette

Now Playing: North Korea may back out of summit with U.S.

Now Playing: Severe Weather hits the Northeast

Now Playing: Co-pilot partially sucked out of plane

Now Playing: Royal wedding headwear