The fashion designer, 31, looked jaw-droppingly stunning when she wed her handsome - and very rich - beau in Kensington Palace on Friday (10 July).
Nicky wore a couture lace gown, thought to be Valentino, with long train and traditional veil. Beautiful!
And so it should be - it's rumoured to have cost £50,000!
Pictured leaving Claridge's ahead of the ceremony, Nicky looked demure and regal as she held a perfect white bouquet of flowers.
We wonder if sister Paris caught it after the ceremony?
Nicky and banking heir James hosted a pre-wedding dinner with guests in the evening at Spencer House in Mayfair.
They were joined by Nicky's sister Paris, who was her maid of honour.
On the wedding day, Paris looked gorgeous in a baby blue floor-length strapless frock.
Before the wedding, she tweeted: "So happy that my sister found the man of her dreams.
"They make the perfect couple! So excited for their wedding today! #MrsRothschild."
Reports say Lionel Richie performed at the wedding party, while Paris turned DJ at the end of the night.
Nicky and James got engaged in August last year.
He popped the question while they were enjoying a romantic boat ride on Lake Como in Italy.
Nicky threw her bachelorette party in Miami.
Congratulations to Nicky and James!
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