Hilton, 42, the great-granddaughter of Hilton Hotels founder Conrad Hilton, posted photos of Phoenix Barron Hilton Reum in an Instagram post on Thursday. “Baby Phoenix. Our whole entire world,” she wrote.
The reality star and husband Carter Reum announced the boy’s birth by surrogate on Jan. 24, People reported.
Hilton wears a white robe while holding the boy as Carter Reum kisses her forehead. In another shot, Hilton wears a simple white robe while holding her son, who is dressed in a white onesie and matching white hat, according to People.
Hilton revealed the name she and Reum chose on her podcast, “This Is Paris,” on Wednesday.
She said that not even her mother or sister had been told the child’s name, CNN reported.
“I’m so obsessed with my little angel and when he looks into my eyes, I just melt,” Hilton told of Glamour UK in an interview. “He’s such a good baby.”
Paris Hilton (left), 19, a year older than screen legend Elizabeth Taylor when Elizabeth married Paris” grandfather, Conrad "Nicky" Hilton Jr, poses with her sister Nicky in Las Vegas, September 1999. The marriage between Paris” grandfather and Elizabeth Taylor lasted just eight months and caused a great scandal at the time. Now Paris is making some potential headlines of her own. Already linked to "Titanic" star Leonardo DiCaprio, Paris and her younger sister Nicky, 16, are making a name for themselves on the New York and Los Angeles party circuit. Her Hollywood friends say the precocious teen has been going to nightclubs since she was 13, claiming she was 22 and getting away with it. Her friends include children of other celebrities: Nicole Richie, daughter of Lionel; Kidada Jones, daughter of Quincy; Brent Shapiro, son of O.J. Simpson lawyer Robert and Bijou Phillips, daughter of John. "Right now I am working on recording an album," Paris told Vanity Fair magazine. She has also completed filming an independent film called "Sweetie Pie," a teen thriller where she plays the title role. "Basically I am killed, like, right in the beginning," she says. She is also featured in a documentary called "Guest List Only." It started out being about a bunch of Los Angeles club girls, but now it is mainly about Paris. (Photos by Dan Callister/Online USA)
Paris Hilton poses for photographers while arriving at the Sony Playstation 2 launch party October 18, 2000 at the Pacific Design Center in West Hollywood, CA. (Photo by Chris Weeks/Liaison)
Model Paris Hilton arrives for a party January 24, 2001 at the Sundance Film Festival in Park City, UT. (Photo by Michael Smith/Newsmakers)
Paris Hilton walks down the runway at the Anand Jon Fall 2001 fashion show February 15, 2001 at the World Wrestling Federation theme restaurant in New York City. (Photo by George De Sota/Newsmakers)
Model Paris Hilton poses outside Joseph’s nightclub September 24, 2001 in Hollywood, CA. (Photo by David Klein/Getty Images)
Model Paris Hilton attends the Maxim Magazine Heats Up Los Angeles With The Pussycat Dolls party to celebrate the December issue of "Maxim" magazine at The Henry Fonda Theatre December 3, 2002 in Hollywood, California. (Photo by Jon Kopaloff/Getty Images)
Model Paris Hilton attends the "Sony Ericsson’s Hollywood Premiere Party 2003" at The Palace on January 9, 2003 in Hollywood, California. (Photo by Jon Kopaloff/Getty Images)
Playboy Founder Hugh Hefner(R) and Heiress Paris Hilton pose at The Standard Club June 6, 2003 in West Hollywood, California. (Photo by David Klein/Getty Images)
Nicole Richie (L) and Paris Hilton during the premiere party for "The Simple Life" on December 2, 2003 at Bliss in Los Angeles, California. (Photo by Doug Benc/Getty Images)
Paris Hilton (L) and Nicole Richie are seen on a poster for the "Simple Life 2" Welcome Home Party at The Spider Club on April 14, 2004 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
Nicole Richie (L) and Paris Hilton arrive for the "Simple Life 2" Welcome Home Party at The Spider Club on April 14, 2004 in Hollywood, California. (Photo by Frazer Harrison/Getty Images)
Nick Carter and Paris Hilton arrive for the release of the S. Carter Tennis shoe party at the Playstation 2 Estate on July 3, 2004 in South Hampton, New York. (Photo by Brad Barket/Getty Images)
Paris Hilton attends Sean "P. Diddy" Combs 35th Birthday Celebration on November 4 2004 in New York City. (Photo by Peter Kramer/Getty Images)
Actress Paris Hilton and actress Lindsay Lohan pose for pictures at the Evening with an Icon – Happy Birthday Marilyn Monroe auction at Meson G on June 1, 2005 in Los Angeles, California. (Photo by Michael Buckner/Getty Images)
Socialite Paris Hilton and fiance, Greek shipping heir Paris Latsis are seen in front of the stage as Madonna performs at "Live 8 London" in Hyde Park on July 2, 2005 in London, England. The free concert is one of ten simultaneous international gigs including Philadelphia, Berlin, Rome, Paris, Barrie, Tokyo, Cornwall, Moscow and Johannesburg. The concerts precede the G8 summit (July 6-8) to raising awareness for MAKEpovertyHISTORY. (Photo by Chris Jackson/Getty Images)
Socialite/actress Paris Hilton and her friend Kim Kardashian attend the Octoberfest to promote the new canned sparkling wine "Rich Prosecco" at the Munich Octoberfest on September 25, 2006 in Munich, Germany. (Photo by Thomas Niedermueller/Getty Images)
In this photo made available by the Los Angeles Sheriff’s Department June 4, 2007, Paris Hilton is seen in her booking photo. (Photo by Los Angeles Sheriff’s Department via Getty Images)
Paris Hilton and Good Charlotte guitarist Benji Madden appear at the after-party for a special screening of the Lionsgate film, "Repo! The Genetic Opera" at Prive Las Vegas inside the Planet Hollywood Resort & Casino during the early morning on November 7, 2008 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
Paris Hilton (L) and her attorney David Chesnoff appear at the Clark County Regional Justice Center September 20, 2010 in Las Vegas, Nevada. Hilton pleaded guilty to two misdemeanors, drug possession and obstructing an officer, as part of a plea deal worked out with prosecutors following her August 27 arrest for cocaine possession on the Las Vegas Strip. As part of the agreement, Hilton will serve a year of probation, pay a USD 2,000 fine, serve 200 hours of community service and must complete a drug abuse program in order to avoid jail time and a felony conviction. (Photo by Isaac Brekken/Getty Images)
Paris Hilton attends "The Rover" premiere during the 67th Annual Cannes Film Festival on May 18, 2014 in Cannes, France (Photo by Gareth Cattermole/Getty Images)
Paris Hilton photographed at the Rosé Rush MTV launch party during a promotion visit to Australia to launch her 23rd fragrance, Rosé Rush on November 29, 2017 in Sydney, Australia. (Photo by Cole Bennetts/Getty Images for Paris Hilton)
Paris Hilton and Chris Zylka attend Byron Allen’s Oscar Gala Viewing Party to Support The Children’s Hospital Los Angeles at the Beverly Wilshire Four Seasons Hotel on March 4, 2018 in Beverly Hills, California. (Photo by Jesse Grant/Getty Images)
Paris Hilton attends the screening of "The American Meme" during the 2018 Tribeca Film Festival at Spring Studios on April 27, 2018 in New York City. (Photo by Mike Coppola/Getty Images for Tribeca Film Festival)
Paris Hilton attends the 2018 Tribeca Film Festival World Premiere of Bert Marcus’ THE AMERICAN MEME on April 27, 2018 at Spring Studios in New York City. (Photo by Dimitrios Kambouris/Getty Images for Bert Marcus Productions)
Paris Hilton poses backstage at Marco Marco Debuts Collection Seven with Style Fashion Week at Hammerstein Ballroom on September 8, 2018 in New York City. (Photo by Jennifer Graylock/Getty Images for Marco Marco)
Paris Hilton attends the 2019 WWD Beauty Inc Awards at The Rainbow Room on December 11, 2019 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
Paris Hilton attends The American Heart Association’s Go Red for Women Red Dress Collection 2020 at Hammerstein Ballroom on February 05, 2020 in New York City. (Photo by Mike Coppola/Getty Images for American Heart Association )
Paris Hilton (L) and Carter Reum attend the “This Is Paris" premiere during the 2021 Tribeca Festival at Hudson Yards on June 20, 2021 in New York City. (Photo by Monica Schipper/Getty Images)
(L-R) Paris Hilton, Kathy Hilton, and Nicky Hilton Rothschild attend The Abbey’s 16th annual Toy Drive for Children’s Hospital LA at The Abbey Food & Bar on September 21, 2021 in West Hollywood, California. (Photo by Rodin Eckenroth/Getty Images)
Actress and model Paris Hilton speaks during a news conference outside the U.S. Capitol October 20, 2021 in Washington, DC. Congressional Democrats held a news conference with Hilton to discuss child abuse and legislation to establish a “bill of rights” to protect children placed in congregate care facilities. (Photo by Alex Wong/Getty Images)
FILE PHOTO: (L-R) Paris Hilton and Carter Reum attend the 10th Annual LACMA ART+FILM GALA honoring Amy Sherald, Kehinde Wiley, and Steven Spielberg presented by Gucci at Los Angeles County Museum of Art on November 06, 2021 in Los Angeles, California. The couple got married Nov. 11 in Bel-Air.