Hilton announced on Thanksgiving via Instagram a second child, a daughter. She shared a photo featuring a pink Peter Pan collared baby shirt with the name London stitched on the front, with heart sunglasses and a stuffed animal.
Hilton, 42, captioned the photo, "Thankful for my baby girl" with a face holding back tears emoji, pink heart emoji and baby emoji.
Paris Hilton's husband Carter Reum talks keeping son Phoenix a secret
Hilton's announcement is much less secretive than the announcement of her first child.
In a teaser for Season 2 of her reality series "Paris in Love" posted on Wednesday, the couple opened up about how they first kept Phoenix a secret.
Reum said initially he wanted to share the news of their son's anticipated arrival, but his wife preferred to keep their baby news hidden.
"I don't think it ever hit me we weren't going to tell anyone, that was really Paris," Reum said in a confessional. "My initial inclination was to tell my family and get everyone excited, hers was to hold the secret. But she's had to go through life having to protect herself, so I was gonna do everything I could to be a good teammate."
Hilton also discussed a plan if their son, who was born via surrogate in January, was revealed by paparazzi at the hospital.
"If people found out there would be paparazzi all over Cedars (Sinai Hospital in Los Angeles) I'm hoping and praying that no one at the hospital tells," she said in a clip of the couple riding in a car. "If anyone recognizes me let's pretend that it's our nephew."
"Can't blow our cover now, we've done such a good job," Reum responded.
"For now we've just been keeping everything really private," Hilton said on the podcast. "Not even my mom or my sister or my best friends – no one knew literally until he was over a week old, so it was really nice just to have that with Carter be our own journey together because I just feel that my life has been so public, and I've never really had anything just be mine."
Hilton added that she decided to keep her baby news under wraps even from close relatives because of the challenges of keeping a secret while living in the public eye.
"If you tell one person, then they tell someone, and then all of a sudden it's in TMZ or Page Six," she said. "So Carter and I literally made a pact together that we would not tell anyone."