The reality wedding extravaganza of the year between Kim Kardashian and Kris Humphries will take place under tight security at a $20-million Montecito estate on Saturday. The tents are up and private helicopters will patrol the skies during the grand celebration, which is being compared to the royal wedding of Prince William and Kate Middleton.

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The 500+ A-list guests will wear black or white, the bridesmaids green, and Kim is said to have three different Vera Wang gowns on hand. She will also reportedly dye her natural brunette locks a bit darker to look "timeless."

So how much is this $10-million dream wedding costing the Kardashians? According to The Hollywood Reporter's Leslie Bruce, the entrepreneurial reality family will most likely make money from the nuptials.

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Kim, 30, reportedly pocketed $50,000 from Tao nightclub in Las Vegas for hosting her bachelorette party there. Bruce Jenner, Kim's stepdad, is said to have negotiated a $1.5-million deal with a magazine for exclusive rights to the wedding photos.

The lucky vendors involved in Kim's special day are discounting or giving their products/services for free, and in return, "get mass exposure of just an astronomical level," Leslie explains.

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Here is a breakdown of the vendors giving Kim and Kris their goodies for free, or at a discount, in exchange for publicity, according to The Hollywood Reporter.

* Invitations by Lehr & Black: $10,000

* Kris Jenner's facelift: $50,000

* Las Vegas bachelorette party penthouse pad at the Palazzo: $2,000 per night

* Hansen's Cakes: $6,000

* 3 Vera Wang Wedding Gowns: $20,000 each

* $2-Million Engagement Ring by Lorraine Schwartz: given to Kris Humphries for a fraction of the cost

The blessed union between Kim and Kris will take place this Saturday, and the four-hour special will air on October 9 and 10 on E!.

Top 10 Most Expensive Celebrity Weddings

#10 David and Victoria Beckham

July 1999 Cost: $800,000 A wedding fit for royalty. Married in a castle near Dublin, the "royal" atmosphere included red velvet thrones, a spectacular fireworks display, and of course, a bridal gown and jewelry fit for a queen.

#8 Tom Cruise and Katie Holmes

November 2006 Cost: $2 million The TomKat wedding was a media spectacle that took place in Italy's 15th century Odescalchi Castle outside of Rome. The entire wedding party wore Giorgio Armani, and guests dined on a five-course while opera singer Andrea Boccelli performed.

#9 Donald Trump and Melania Knauss

January 2005 Cost: $1 million The real estate mogul and his model wife spared no expense. The bride's Christian Dior gown took approximately 1,000 hours to make. Each of the 500 guests was shuttled by personal drivers.

#7 Elizabeth Hurley and Arun Nayar

March 2007 Cost: $2.5 million The model married the Indian businessman in a celebration that spanned 8 days and two continents. The British ceremony was held in the medieval Sudeley Castle in Gloucestershire. Festivites moved to India where the couple again wed in a traditional Hindu ceremony held in Umaid Bhawan Palace in Jodhpur.

#6 Paul McCartney and Heather Mills

June 2002 Cost: $3 million The star-studded extravaganza included a pageant, grand feast and dazzling fireworks. An Indian-themed reception with lavish flowers, and a million-dollar designer gown to topped it all off.

#5 Selma Hayek and Francois-Henri Pinault

April 2009 Estimated Cost: $3 million The actress and her French billionaire tied the knot in Venice. She wore a Balenciaga gown with a traditional veil, and held a bouquet of orchids and stephanotis with crystals. The festivities began with a carnival-style masked ball and ended with a lavish reception.

#4 Liza Minelli and David Gest

March 2002 Cost: $3.5 million The Oscar-winner and producer said "I do" at Manhattan's Collegiate Church.Best man was Michael Jackson, maid of honor was Elizabeth Taylor. The guests were treated to a 6-foot, 12-tier wedding cake, and were entertained by Tony Bennett, Stevie Wonder and Natalie Cole.

#4 Wayne Rooney and Colleen McLaughlin

June 2008 Estimated cost: $15 million The wedding of television soccer pro Wayne Rooney to Colleen McLaughlin took place in one of the most romantic places in the world, Portofino, Italy, with a four-day celebration on a yacht with 64 guests flown in by private jets. The couple served pizza at the reception!

#2 Grace Kelly and Prince Rainier of Monaco

April 1956 Estimated Cost: $ unknown Every little girl's fairytale come true. The entire Monegasque population of over 3,000 was in attendance. The gown was hand made, decorated with over 800,000 sequins and 1,500 rhinestones and pearls. The Prince created a perfume in honor of his wife, and designed his own uniform that would be worn only that special day.

#1 Vanisha Mittal and Amit Bhatia

November 2006 Cost: $78 million The world's most expensive wedding to date is that of Vanisha Mittal (daughter of billionaire Lakshmi Mittal) and investment banker Armit Bhatia. The wedding was held at a 17th-century chateau in France. Ceremonies went on for five days, and with over 100 dishes prepared. The 1,000 guests received a 20-page silver book invitation. The wine tab alone was a whopping $1.5 million.

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