Paris Hilton says sister Nicky's newborn daughter has given her 'baby fever' (exclusive)

Nicky Hilton Rothschild is the proud mother of two beautiful little girls, and the abundant cuteness is making her famous sister, Paris Hilton, think about starting a family of her own.

ET caught up with the socialite siblings at The Cinema Society's premiere screening of Marvel's Black Panther in New York City on Tuesday, and the new mom gushed over her precious little bundle of joy, Theodora "Teddy" Marilyn.

"She's good. She's very tiny. She's eight weeks," Nicky shared. 

On Monday, the 34-year-old heiress posted the first photo of her daughter to Instagram, writing, "Kisses + cuddles before out the door to catch the @oscardelarenta show."

After giving birth less than two months ago, Nicky is staying fit and healthy -- a feat that seemed to impress her sister.

"You literally cannot tell," Paris, 36, marveled.

The former reality star admitted to ET that seeing Nicky with her newborn daughter -- as well as her and husband James Rothschild's 1-year-old little girl, Lily-Grace Victoria -- has given her "baby fever."

"Also it gives me hope, because I know she has amazing genes, it runs in the family, so I'm not gonna have to worry," Paris joked.

While she and fiancé Chris Zylka aren't gearing up for parenthood just yet, Paris said that wedding planning is in full swing.

28 PHOTOS
Paris Hilton and Chris Zylka together
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Paris Hilton and Chris Zylka together
SYDNEY, AUSTRALIA - NOVEMBER 30: Paris Hilton and fiance Chris Zylka pose at the launch of her new fragrance Rose Rush on November 30, 2017 in Sydney, Australia. (Photo by Don Arnold/WireImage)
SYDNEY, AUSTRALIA - NOVEMBER 29: Paris Hilton and Chris Zylka arrive at Rose Rush Party Sydney on November 29, 2017 in Sydney, Australia. (Photo by Hanna Lassen/WireImage)
LOS ANGELES, CA - NOVEMBER 15: Paris Hilton and Chris Zylka are seen on November 15, 2017 in Los Angeles, California. (Photo by gotpap/Bauer-Griffin/GC Images)
MEXICO CITY, MEXICO - NOVEMBER 07: Paris Hilton and her boyfriend Chris Zylka attend the launch of Paris Hilton's new shoe line for Dorothy Gaynor at Pabellon Polanco on November 7, 2017 in Mexico City, Mexico. (Photo by Victor Chavez/Getty Images)
LOS ANGELES, CA - OCTOBER 31: Paris Hilton (L) and Chris Zylka at treats! Magazine's 7th Halloween Party in Partnership with Rolls-Royce Black Badge, Absolut Elyx, & Perrier Jouet on October 31, 2017 in Los Angeles, California. (Photo by Gabriel Olsen/Getty Images for Treats Magazine )
NEW YORK, NY - OCTOBER 28: Paris Hilton (L) and Chris Zylka attend 2017 amfAR and The Naked Heart Foundation Fabulous Fund Fair at Skylight Clarkson Sq on October 28, 2017 in New York City. (Photo by Michael Stewart/FilmMagic)
NEW YORK, NY - OCTOBER 26: Paris Hilton and Chris Zylka during the Fashion Group International 34th Annual Night of Stars Gala on October 26, 2017 in New York City. (Photo by Gonzalo Marroquin/Patrick McMullan via Getty Images)
LOS ANGELES, CA - SEPTEMBER 21: Paris Hilton and Chris Zylka attend the premiere of 'SPF-18' at University High School on September 21, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - SEPTEMBER 21: Businesswoman Paris Hilton (L) and actor Chris Zylka attend the premiere of Alex Israel's 'SPF-18' at University High School on September 21, 2017 in Los Angeles, California. (Photo by David Livingston/Getty Images)
NEW YORK, NY - SEPTEMBER 11: Model Paris Hilton (L) and actor Chris Zylka attend Annual Charity Day hosted by Cantor Fitzgerald, BGC and GFI at BGC Partners, INC on September 11, 2017 in New York City. (Photo by Robin Marchant/Getty Images for Cantor Fitzgerald)
LOS ANGELES, CA - AUGUST 25: Paris Hilton and Chris Zylka are seen on August 25, 2017 in Los Angeles, California. (Photo by SMXRF/Star Max/GC Images)
LOS ANGELES, CA - AUGUST 23: Paris Hilton and Chris Zylka are seen on August 23, 2017 in Los Angeles, California. (Photo by gotpap/Bauer-Griffin/GC Images)
LOS ANGELES, CA - AUGUST 21: Paris Hilton and Chris Zylka are seen on August 21, 2017 in Los Angeles, California (Photo by SMXRF/Star Max/GC Images)
FORMENTERA, SPAIN - AUGUST 11: Paris Hilton and Chris Zylka are seen on August 11, 2017 in Formentera, Spain. (Photo by Europa Press/Europa Press via Getty Images)
LOS ANGELES, CA - JUNE 30: Paris Hilton and Chris Zylka are seen at LAX on June 30, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JUNE 12: TV personality Paris Hilton and actor Chris Zylka arrive at the U.S. Premiere of 'The Beguiled' at Directors Guild of America on June 12, 2017 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JUNE 08: Paris Hilton and Chris Zylka are seen at LAX on June 08, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MAY 31: Paris Hilton and Chris Zylka are seen on May 31, 2017 in Los Angeles, CA. (Photo by Hollywood To You/Star Max/GC Images)
CAP D'ANTIBES, FRANCE - MAY 25: Paris Hilton and Chris Zylka arrive at the amfAR Gala Cannes 2017 at Hotel du Cap-Eden-Roc on May 25, 2017 in Cap d'Antibes, France. (Photo by Tony Barson/FilmMagic)
CANNES, FRANCE - MAY 24: Paris Hilton (L) and Chris Zylka attend the L'Oreal Paris Cinema Club party, celebrating L'Oreal's 20th anniversary as the official beauty partner of the Cannes Film Festival, at the Martinez Hotel Beach on May 24, 2017 in Cannes, France. (Photo by David M Benett/Dave Benett/Getty Images)
CANNES, FRANCE - MAY 24: Paris Hilton and Chris Zylka attend the Gala 20th Birthday Of L'Oreal In Cannes during the 70th annual Cannes Film Festival at Hotel Martinez on May 24, 2017 in Cannes, France. (Photo by Antonio de Moraes Barros Filho/FilmMagic)
CAP D'ANTIBES, FRANCE - MAY 23: Paris Hilton (L) and Chris Zylka attend the de Grisogono 'Love On The Rocks' party during the 70th annual Cannes Film Festival at Hotel du Cap-Eden-Roc on May 23, 2017 in Cap d'Antibes, France. (Photo by David M Benett/Dave Benett/Getty Images )
CANNES, FRANCE - MAY 20: (L-R) Paris Hilton and boyfriend Chris Zylka arrive at Nice airport during the 70th annual Cannes Film Festival at on May 20, 2017 in Cannes, France. (Photo by Marc Piasecki/GC Images)
BEVERLY HILLS, CA - MAY 05: Socialite Paris Hilton (L) and Actor Chris Zylka (R) attend the 24th annual Race To Erase MS Gala at The Beverly Hilton Hotel on May 5, 2017 in Beverly Hills, California. (Photo by Paul Archuleta/FilmMagic for Fashion Media )
LOS ANGELES, CA - APRIL 12: Paris Hilton and Chris Zylka are seen at LAX on April 12, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 03: Paris Hilton and Chris Zylka are seen on April 03, 2017 in Los Angeles, California. (Photo by BG002/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 22: Paris Hilton and Chris Zylka are seen at LAX on March 22, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 18: Paris Hilton (L) and Chris Zylka attend day three of TAO, Beauty & Essex, Avenue and Luchini LA Grand Opening on March 18, 2017 in Los Angeles, California. (Photo by Michael Kovac/Getty Images for TAO)
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"I'm finally looking for my wedding dress so Nicky and I have fittings this week," she revealed. "And she has such beautiful taste that I can't pick the wedding without my maid of honor."

Being her sister's maid of honor is a responsibility that Nicky said she really enjoys.

"I'm loving it," Nicky shared. "I'm most excited for [planning] the bachelorette party."

ET caught up with Paris and her soon-to-be-husband back in January at HBO’s Golden Globes after party, where the happy couple admitted that they want to tie the knot "as soon as possible."

29 PHOTOS
Nicky Hilton Rothschild
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Nicky Hilton Rothschild
PARIS, FRANCE - JULY 05: Nicky Hilton attends the Valentino Haute Couture Fall/Winter 2017-2018 show as part of Paris Fashion Week on July 5, 2017 in Paris, France. (Photo by Marc Piasecki/WireImage)
PARIS, FRANCE - JULY 05: Nicky Hilton attends the Valentino Haute Couture Fall/Winter 2017-2018 show as part of Paris Fashion Week on July 5, 2017 in Paris, France. (Photo by Marc Piasecki/WireImage)
PARIS, FRANCE - JULY 05: Nicky Hilton attends the Valentino Haute Couture Fall/Winter 2017-2018 show as part of Paris Fashion Week on July 5, 2017 in Paris, France. (Photo by Marc Piasecki/WireImage)
NEW YORK, NY - JUNE 21: Nicky Hilton is seen walking in Soho on June 21, 2017 in New York City. (Photo by Raymond Hall/GC Images)

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