The 35-year-old businesswoman is "so excited" for her sister Nicky Hilton Rothschild to give birth to her daughter and has already bought the tot a host of gifts, reported Femalefirst.
"I can't begin to describe the feeling, I'm so excited and so thrilled for Nicky. She will be a wonderful mom 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."
Hilton recently threw a lavish baby shower for Nicky at The Towers at the Waldorf Astoria in New York at which she presented her younger 32-year-old sibling with a white and pink heart-shaped cake.