Piers Morgan sits down with designer Elizabeth Emanuel tonight to talk Kate Middleton, Princess Diana and dresses. Emanuel designed Princess Diana's dress for her 1981 nuptials to Prince Charles. What was Diana like during the planning process? "She never seemed to be under pressure," Emanuel says. "She was always very relaxed and I was the one who was getting stressed out."

Emanuel is confident Kate's dress will look nothing like Diana's. Today's style is "a lot more paired down now," she says. She describes Kate's look as "very classic, quite plain actually." Emanuel does think we'll see something unexpected. "I'm sure there is going to be some kind of a twist."

Catch the full interview tonight at 9pm ET/PT.

Piers Morgan is in London tonight and every night this week reporting on the royal wedding. Tonight, Piers sets the stage for the week with royal wedding correspondent Katie Nicholl.

Piers also sits down with actress Jane Seymour, OBE, to talk predictions and the royal family. Designer Elizabeth Emanuel has her own predictions about the dress Kate Middleton will wear emphasizing it will be very different from the dress Emanuel designed for Diana in 1981.

We'll also hear stories of William's past from his former chef Carolyn Robb and learn about security surrounding the wedding from terrorism expert Kevin Toolis.

To see behind the scenes footage follow Piers Morgan Tonight on facebook and @PiersTonight on twitter. Get all the details of the royal wedding week tonight at 9pm ET/PT on CNN.

Each day, we here at "Piers Morgan Tonight" put together the news you need to know – from what happened last night to what will happen today.

For April 25, 2011 – Details released about Guantanamo detainees, Rep. Giffords to attend shuttle launch Friday, Gadhafi compound hit by airstrikes... FULL POST