Nicky Hilton married James Rothschild in a storybook wedding ceremony Friday and Kensington Palace in London. Sis Paris was by Nicky's side to see the bride walk down the aisle in a white lace $78,000 Valentino gown with extended train.

The couple, both 31 years old, were surrounded by friends and family. Paris served as Nicky's maid of honor in a periwinkle blue chiffon gown with rhinestone waistband.

Last night, the younger Hilton celebrated her final evening as a single girl; brother Barron posted this pic from the party.

This isn't just a fairytale wedding; it will likely be a fairytale marriage, as the union brings together two of the world's wealthiest families -- Nicky, heiress to the Hilton Hotel fortune in excess of $2.3 billion; and James, heir to the British banking dynasty worth around $18.5 billion. Not a bad bank account to start out with!

The wedding, hosted at Kensington Palace's Orangery, was attended by such famous names as Chelsea Clinton, and Kate Beckinsale.

The young couple met at Petra Ecclestone and James Stunt's 2011 wedding. Rothschild popped the question last summer during a vacation in Lake Como, Italy.

Hilton was previously married to family friend Todd Meister in 2004 after a quickie wedding in Las Vegas. The two annulled the marriage three months later.