Cat Deeley is 'Royally Mad'

With the royal wedding just weeks away, TV host Cat Deeley joined "Extra's" Mario Lopez at The Grove to talk about her new show on the BBC, "Royally Mad."

"We took five royally obsessed Americans and we went and saw London through their eyes, basically, and their enthusiasm was completely infectious," Deeley revealed. Cat, who is hosting the show on a whistle-stop tour of royal London, believes the fascination and mania is comparable to the one with the Kennedys.

Two of the five "Royally Mad" Americans also stopped by The Grove to talk about their obsession. One contestant admitted he has way "too much time. We have Google alerts... everything."

Mario tested the contestants' knowledge of the royals with a quiz. Find out how they did!

Part one of "Royally Mad" premiered on April 12 and part two premieres Tuesday, April 19, 10:00 PM ET/PT.

For the latest coverage of the royal wedding, go to ExtraTV's Royal Wedding Page!