The heiress confirmed the news on Twitter, revealing she welcomed daughter Teddy Marilyn Rothschild on December 20.
"Christmas came early! On December 20th James and I welcomed a baby girl, Teddy Rothschild into the world," the 34-year-old wrote. "Feeling very blessed this holiday season."
Teddy Marilyn is named after Hilton and sister Paris Hilton‘s paternal grandmother Marilyn June Hawley.
The fashion designer and British banker Rothschild are already parents to Lily-Grace Victoria, who was born in July 2016.
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