Paris Hilton says her mother and sister didn't know about the birth of her son until he was a week old

• Paris Hilton's mother and sister did not know about her new baby until he was over a week old.
• She also revealed that the child's name was Phoenix Barron Hilton Reum.

Paris Hilton's family did not know about her newborn son until he was over a week old, she said.

In her iHeartRadio "This Is Paris" podcast on Thursday, the socialite said she did not tell her mother Kathy Hilton, or her sister, Nicky Hilton Rothschild, about the baby's birth.

The boy was born early this year, via a surrogate.

Hilton said that she and her husband Carter Reum kept the birth a secret because she "wanted to have this journey be us only."

"I just feel that my life has been so public and I've never really had anything just be mine," she said during her podcast. "I feel like just my life in so many ways has been invaded."

Hilton said she and Reum thought the news would spread fast if they told their families.

"We were just nervous because if we tell one person, then they tell someone, and then all of a sudden it's like in TMZ and Page Six," Hilton, 42, said.

"I have had enough of my life like that," she said.

But keeping the news secret was worth the wait. Her mother Kathy's reaction to seeing the baby was "priceless," Hilton said in the podcast.

"When I introduced my mom to our baby boy, it was amazing to see the look on her face. She was so surprised," she said.

Hilton publicly announced the news via a tweet on January 24.

"You are already loved beyond words," Hilton wrote, along with a picture of a baby's hand holding manicured fingers.

In a video on Instagram on Thursday, Hilton revealed that the child's name was Phoenix Barron Hilton Reum, something she had "decided on years ago."

Hilton noted that Phoenix, a city in Arizona, is also the name of a mythical bird "that flames out and rises from the ashes to fly again."

"I want my son to grow up knowing disaster and triumph go around and come around throughout our lives," she said in her video on Instagram.

His middle name "Barron" is a tribute to her late grandfather William Barron Hilton, the hotel magnate and chairman of Hilton Hotels Corporation.

Representatives for Hilton, Kathy Hilton, and Nicky Hilton Rothschild did not immediately respond to Insider's requests for comment.