Surprise, Paris Hilton has another baby! Hilton and husband Carter Reum revealed last week that they’d welcomed daughter London Marilyn Hilton Reum via surrogate, promoting son Phoenix to big brother status at the age of 10 months old.

In a new interview with Romper, Hilton revealed why she’d kept her family planning under wraps – even to her own relatives. They introduced baby London to the extended Hilton clan as a Thanksgiving surprise.

“My life has been so public, so out there. I didn’t want my son coming into this world with any negative energy,” Hilton told Romper of keeping Phoenix’s imminent arrival quiet. “I’m really happy I did it that way, just for Carter and I to have that journey together without the outside world chirping in.”

The hotel heiress and lifestyle figure calls her family “the cutesy crew,” and said that she dreamed of having a daughter.

“I always imagined my mini-me, putting her in little dresses and all the mommy-and-me things we could do together,” she said. “Just having my little best friend.”

Her mother, Kathy Hilton, and sister Nicky Hilton both knew that London was on the way, but not when. The public was kept in the dark on both pregnancies, as Hilton didn’t slow her public schedule. She feared childbirth due to her past, she said, prompting the help of a surrogate for both children.

“I just have so much PTSD from what I went through as a teenager,” Hilton said. She has written in the past of sexual abuse and medical trauma that she experienced at a boarding school in Utah as a teen. “If I’m in a doctor’s office, I get a shot, anything, I will literally have a panic attack and I can’t breathe. I just knew that would not be healthy for me or the baby, growing inside of someone who has such high anxiety.”

She says she’ll probably be “really strict,” which may surprise some due to her past as a club fixture alongside the likes of Lindsay Lohan and Britney Spears.

“It’s a scary world out there, especially today. I’m just terrified when they become teenagers,” she said. She said she’d be happy to never set foot in a club again, and would keep the kids far away from the entertainment industry if she has any say at all.

“I'm hoping that they want to be scientists,” she said of her ambitions for London and Phoenix.

Hilton calls this stage of life her “mom era.”

“This is my best era yet,” she said. The 42-year-old sees the about-face from her past antics, and she loves it.

“I used to look at my friends who’d be like, ‘Oh, I have to go home to my kids and my husband,’ like, ‘You’re so lame. This is so fun. I can’t imagine being like that,’” she said. “Now I’m one of those boring people, and I couldn’t be happier. I couldn’t imagine it any other way.”