The 32-year-old hotel heiress and husband James Rothschild welcomed their first child into the world on Friday (08Jul16). Sunday marked one year since the couple's lavish wedding at London's Kensington Palace, and Nicky took to Instagram to reveal there was nothing in the world she wanted more than her gorgeous new arrival.

"Thankful for the best anniversary gift ever...our beautiful daughter Lily-Grace," Nicky wrote alongside a snap from her wedding day.

Her family members were also quick to offer their congratulations on the occasion, with sister Paris writing: "Happy 1 Year Anniversary to the most beautiful bride & mother @NickyHilton. #RelationshipGoals #FamilyGoals."

Nicky's mother Kathy added: "Happy 1 year Anniversary to@NickyHilton& James!!! We love you, Mom & Dad. XxOoXxOo"

James and Nicky were surrounded by family members as Lily-Grace made her arrival in New York City on Friday morning. Following the baby news, Paris took to Twitter to reveal her excitement about having a niece, writing: "So happy for my sister and her new baby girl Lily-Grace! I'm in love! So excited to be an aunt! #AuntParis."

Paris had previously expressed her excitement at becoming an aunt, gushing, "I can't begin to describe the feeling, I'm so excited and so thrilled for Nicky. She will be a wonderful mum and I want to be the best aunt I can be. I'm already shopping for my niece and can't wait to meet her soon.

"The whole family cannot wait," she added. "This is the first baby, the first time my (parents) being grandparents. Everyone's thrilled."

Nicky had documented her pregnancy on social media, and recently shared a sweet snap of herself cradling her bulging belly while sitting in her daughter's nursery, captioning the snap: "Preparing for the little one's arrival."

She has yet to share the first picture of her daughter, however, with fans eagerly awaiting a sneak peek.