According to photos she shared on Instagram, guests included her sister Paris, along with her parents, Richard and Kathy Hilton.
Also spotted were "Real Housewives of Beverly Hills" stars Kim Richards, who is also Nicky's aunt, and her daughter Brooke Brinson. Noticeably missing was fellow star Kyle Rickards, another one of Nicky's aunts, although her children -- Alexia and Portia Umansky -- attended.
Hilton Rothschild, 32, and her husband, a British banking heir, announced they were expecting in January. The two wed at the Kensington Palace Orangery in London last year.