Nicky Hilton Praises 'Best Anniversary Gift Ever' After Welcoming Baby Lily-Grace With Hubby James Rothschild

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The heiress celebrated her first wedding anniversary with the arrival of her first child.

It’s hard to believe that just a year ago, Nicky Hilton was walking down the aisle in her lavish London wedding to husband James Rothschild. Since then the couple has welcomed their first child, a daughter named Lily-Grace.

WATCH: EXCLUSIVE: Nicky Hilton Gives Birth, Welcomes Baby Girl Lily-Grace!

ET exclusively broke the news of the pair’s newest addition, and on Sunday, Hilton took to Instagram to both confirm the birth and to celebrate her first wedding anniversary.

“Thankful for the best anniversary gift ever,” she captioned a wedding pic with her hubby. “Our beautiful daughter Lily-Grace.”

WATCH: Paris Hilton Throws Pregnant Sister Nicky a Picture-Perfect Baby Shower in New York: See the Adorable Pics!

Baby Lily-Grace arrived on Friday morning, just two days shy of the couple’s milestone anniversary. The heiress had been sharing photos of herself preparing for her little girl on Instagram. Little Lily-Grace is already the proud owner of a pristine pink dollhouse.

Hilton and Rothschild wed at Kensington Palace (home to William and Kate) on July 10, 2015. The bride wore a stunning custom-made Valentino gown, and the then-newlyweds celebrated on a picturesque South African honeymoon shortly after.