The blond beauty looked absolutely gorgeous in a dramatic white Valentino haute couture wedding dress, which features a voluminous ball skirt and sheer illusion sleeves.
Hilton, whose hair was pulled back for the occasion, also toted a white bouquet and a sported a veil that spanned the length of her dress train.
Nicky's older sister, Paris Hilton, served as the maid of honor and wore a pale-blue floor-length chiffon dress by Dennis Basso, who designed the bridesmaids' dresses.
Her mother, Kathy Hilton, also donned a periwinkle blue gown, which featured white embroidery on the bottom.
In a wedding fit for a King and Queen (literally), Nicky Hilton and James Rothschild tied the knot at Kensington Palace in London on Friday, E! A source says the lovebirds were married in front of a wall of white flowers and reveals that non-denominational ceremony was performed by a woman.
We're told that Kyle Richards and her family attended the I-dos, seemingly putting their alleged family feud to rest.
Kim Richards, however, was not present at the ceremony as she is currently in rehab seeking help for substance abuse.
James' Spencer House on Thursday, a black tie ceremony and reception on Friday which will be followed by a casual lunch on Saturday at The Oragery restaurant.
For the reception, we're told Nicky changed into a sequined mini-dress and "looked beyond gorgeous." Kim Richard's daughter Whitney, serenaded by the couple by singing "Lean On Me," and Paris, Kathy and James all gave toasts. ' I really just want everything traditional and beautiful," she previously told So many brides today want avant garde, over the top, fashion.
Additional guests included Chelsea Clinton and husband Marc Mezvinsky, who are friends of the groom, as well as Jeff Beacher.
Paris also brought along boyfriend Thomas Gross to all the weddng events, and the two were said to be "inseparable." The lavish wedding was a 3-day affair across the pond that included cocktails at St.