Royal Tour: Prince William and Kate's Favorite London Hangouts

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Curious about where Prince William and his fiancée Kate Middleton like to hang out in London? Royal correspondent and William and Harry: Behind the Palace Walls author Katie Nicholl gives ET an exclusive tour of the royal couple's hot spots!

First stop is Thurloe Street in Kensington: "This is where William and Kate kick up their royal heels -- the London night club Boujis," Nicholl tells ET. "It's a favorite of the couple and Prince Harry, and I've partied here with them many times. William and Kate are said to be fans of the signature cocktail here at Boujis. It's a combination of champagne, vodka and raspberry liqueur, and it's quite a brew."

Next is Mahiki, a favorite spot for sports stars and the young royals. The Polynesian-themed bar is also a reminder of a not-so-happy time for the prince and his princess-to-be.

"This is where Prince William famously drank his way through the menu after splitting up with Kate Middleton and running up a bar bill of nearly $17,000," reports Nicholl. "Of course, Prince William didn't have to pick up the expensive bar bill. Mahiki took care of that one for him."

These London locales are just two stops on the new "Will and Kate Royal Wedding Walk," created by James Bonney of Celebrity Planet, and another key spot is where Kate may get her wedding dress: Bruce Oldfield.

"Word has it that this British designer is going to be designing Kate Middleton's wedding dress," says Nicholl. "He was one of Princess Diana's favorite designers and he's known for his very traditional dresses."

The final spot on the royal tour is none other than Buckingham Palace.

"This is where the Queen will host the post-wedding reception for the happy couple, and where I'll bet we'll see them kissing on that famous balcony, just like Charles and Diana," says Nicholl. "Well, the countdown is on now. I'll see you in London on April the 29th."