Paris Hilton dazzles at her pop up House of Y2K in

Paris Hilton dazzles at her pop-up House of Y2K in Los Angeles

Paris Hilton gave her iconic 21st birthday dress a modern twist while attending the grand opening of her House of Y2K pop-up in Los Angeles on Thursday.

More than two decades after her milestone birthday and now a new mom, the 42-year-old socialite opted for a less revealing version of the original deep and backless number.

Paris – who was making her first public outing since revealing her son’s name and unveiling his face earlier this week – looked sensational at the outing.

The ‘Simple Life’ star – who welcomed her son Phoenix with her husband Carter Reum, 42, via surrogate last month – dressed up for her evening at the interactive pop-up showroom in partnership with Klarna.

The socialite donned a silver beaded cowl neck mini dress with a fitted style to show off her slim figure.

That's hot!  Paris Hilton gave her iconic 21st birthday dress (right) a modern twist while attending the grand opening of her House of Y2K pop-up in Los Angeles on Thursday The original: Two decades after her milestone birthday and now a new mom, the 42-year-old socialite opted for a less revealing version of the original, deep and backless number

That’s hot! Paris Hilton gave her iconic 21st birthday dress (right) a modern twist while attending the grand opening of her House of Y2K pop-up in Los Angeles on Thursday

She also wore all the matching accessories that matched the theme of House of Y2K’s opening night – which showcased a variety of curated selections from the early 2000s.

For the occasion, the entrepreneur wore a pair of pointed stiletto heels in the same glittery material to match her dress.

She also wore a thick choker around her neck and glittery fingerless gloves on her hands – a reminder of her iconic style during her best known days.

The Stars Are Blind singer carried a shiny hexagonal clutch and geometric rhinestone-framed sunglasses.

At the same time, she also modestly showed off her massive, stunning wedding ring — valued at a whopping $2 million.

The model styled her iconic blonde locks in a straight hairstyle with lash-swept blunt bangs.

For makeup, she rocked a silver eyeshadow look with cat wing eyeliner and full, fluttering lashes.

She looked radiant in a coral pink blush and nude pink lip as she arrived at the opening.

All that glitters: The social media personality was first spotted in a striking and light-reflecting outfit

Hot mom: The social media personality was spotted in a striking and light-reflective outfit for the first time since she revealed her son’s name and revealed his face earlier this week

Hot Mom: Earlier this week she revealed her son's name and revealed his face for the first time

Hot Mom: Earlier this week she revealed her son’s name and revealed his face for the first time

Pop-up opening: The Simple Life star, who welcomed her son Phoenix with her husband Carter Reum, 42, via surrogate last month, dressed up for her evening at the interactive pop-up showroom in partnership with Klarna

Pop-up opening: The Simple Life star, who welcomed her son Phoenix with her husband Carter Reum, 42, via surrogate last month, dressed up for her evening at the interactive pop-up showroom in partnership with Klarna

Showing off: The socialite donned a silver glitter mini dress with a cowl neckline and fitted style to show off her slim figure So Y2K: She also wore all the right accessories to match the theme of House of Y2K's opening night - which showcased a variety of curated selections from the early 2000s

Showing off: The socialite donned a silver glitter mini dress with a cowl neckline and fitted style to show off her slim figure and matched every accessory with her dress to attend her opening night at the House of Y2K

Iconic: She also wore a thick choker around her neck and glittery fingerless gloves on her hands - a reminder of her iconic style during her best known days

Fashionable accessories: The Stars Are Blind singer wore a shiny hexagon clutch and rhinestone-framed geometric sunglasses; She also wore a thick choker around her neck and glittery fingerless gloves on her hands – a reminder of her iconic style during her best known days

Parents' night: She was later seen leaving the event hand in hand with her venture capitalist husband

Parents’ night: She was later seen leaving the event hand-in-hand with her venture capitalist husband – who wore an all-black ensemble to make his media personality wife the star of the show

Opposites attract: The M13 Ventures founder wore an all-black ensemble to make his media personality wife the star of the show

Opposites attract: The M13 Ventures founder wore an all-black ensemble to make his media personality wife the star of the show

She was later seen leaving the event hand in hand with her venture capitalist husband.

The M13 Ventures founder wore an all-black ensemble to make his media personality wife the star of the show.

The Shortcut Your Startup writer donned a leather bomber jacket over a black tee and fitted jeans.

He wore a pair of shiny black sneakers with white laces.

Carter was always the doting husband as he held hands with Paris and guided her while walking to her car.

On the way out, Paris took some time to pose in front of her pink and sparkly Bentley.

She donned her sunglasses and posed in front of the pink and purple lights of the House of Y2K pop-up decor.

All Black Outfit: The Shortcut Your Startup author donned a leather bomber jacket over a black tee and fitted jeans

All Black Outfit: The Shortcut Your Startup author donned a leather bomber jacket over a black tee and fitted jeans

A shiny pair: He wore a pair of shiny black sneakers with white laces

A shiny pair: Wearing a pair of shiny black sneakers with white laces, Carter was always the doting husband as he held hands with Paris and guided her while walking to her car

Happy couple: Carter was always the doting husband as he held hands with Paris and guided her while he walked to her car

Happy couple: Carter was always the doting husband as he held hands with Paris and guided her while he walked to her car

Happy mom: Earlier this week, Paris and her venture capitalist husband revealed their baby son's face in a series of family portraits for the first time

Happy mom: Earlier this week, Paris and her venture capitalist husband revealed their baby son’s face in a series of family portraits for the first time

That's hot!  On the way out, Paris took some time to pose in front of her pink and sparkly Bentley Barbie Pink: She put on her sunglasses and posed in front of the pink and purple lights of the House of Y2K pop-up decor

That’s hot! On the way out, Paris took some time to pose in front of her pink and sparkly Bentley; She donned her sunglasses and posed in front of the pink and purple lights of the House of Y2K pop-up decor

Big reveal: On Thursday, she revealed on her podcast This Is Paris that her son Phoenix's full name is Barron Hilton Reum

Big reveal: On Thursday, she revealed on her podcast This Is Paris that her son Phoenix’s full name is Barron Hilton Reum; Paris and Carter tied the knot in 2021 after previously dating for over two years

Travel back in time: Paris posed with toys and magazines from the noughties Cover Girl: She held up one of her past covers with Nicole Richie

Travel back in time: Paris posed with toys and magazines from the noughties

That's hot!  Paris posed with a velor tracksuit after famously loving the trend

That’s hot! Paris posed with a velor tracksuit after famously loving the trend

Beautiful ladies: Paris posed with mom Kathy Hilton, Kris Jenner and Faye Resnick

Beautiful ladies: Paris posed with mom Kathy Hilton, Kris Jenner and Faye Resnick

Fans: Paris happily posed for selfies Fans: She hugged fans outside of the venue

Fans: Paris happily posed for selfies and hugged fans outside the venue

Earlier this week, Paris and her venture capitalist husband revealed their young son’s face in a series of family portraits for the first time.

Carter also has a 10-year-old daughter named Evie with his ex-girlfriend – former reality TV star Laura Bellizzi.

On Thursday, she revealed on her podcast This Is Paris that her son Phoenix’s full name is Barron Hilton Reum.

Paris and Carter tied the knot in 2021 after previously dating for over two years.

Last month, the reality star announced that they had welcomed their first child via surrogacy, right after announcing their forthcoming book Paris: The Memoir – which is available for pre-order now and will be officially released on March 14.

Her mother, Kathy Hilton, 63, and The Kardashians reality star Kris Jenner, 67, also attended the event to celebrate the collaboration.

The reality star Real Housewives of Beverly Hills wore a hot pink, high-necked, long-sleeved midi dress to support her eldest daughter.

The socialite rocked a matching pink lip and accessorised with diamond-encrusted hoop earrings.

Maternal guests: Her mother Kathy Hilton, 63, and The Kardashians reality star Kris Jenner, 67, also attended the event to celebrate the collaboration

Maternal guests: Her mother Kathy Hilton, 63, and The Kardashians reality star Kris Jenner, 67, also attended the event to celebrate the collaboration

Hot in pink: The reality star Real Housewives of Beverly Hills wore a pink high-necked, long-sleeved midi dress to support her eldest daughter Contrasting looks: The fashion designer was spotted leaving the event with the Kardashians matriarch, who in contrast wore a chic all-black outfit

Contrasting looks: The reality star Real Housewives of Beverly Hills wore a hot pink, high-necked, long-sleeved midi dress to support her eldest daughter, while the Kardashians’ matriarch, who in contrast wore a chic all-black outfit as she died left event

Casual yet chic: Tiffany Haddish, 43, was seen leaving the event in a casual but chic hoodie featuring a skull with blue sequins on the front, skinny jeans and Air Jordan 1s in navy and white

Casual yet chic: Tiffany Haddish, 43, was seen leaving the event in a casual but chic hoodie featuring a skull with blue sequins on the front, skinny jeans and Air Jordan 1s in navy and white

She styled her blonde locks in loose waves for the pop-up event.

The fashion designer was spotted leaving the event with the Kardashians’ matriarch, who, in contrast, wore a chic all-black outfit.

Kris wore a suede blazer over a low-cut black top and accessorised with cat-eye sunglasses.

She also wore black leather gloves and large statement gold earrings.

Actress Tiffany Haddish, 43, influencer Tana Mongeau, 24, and Bling Empire star Christine Chiu, 39, were also spotted at the event.

The stand-up comedian was seen leaving the event in a casual yet chic hoodie featuring a blue sequin skull and crossbones on the front.

The Carmicheal Show sitcom alum wore the hood over her head, revealing only her platinum blonde waves and a flower tucked behind her ear.

The star of 2018 comedy film Night School wore a pair of medium wash skinny jeans and Air Jordan 1s in a navy and white colorway.

Tana Mongeau was also spotted posing outside of the venue in a proper Y2K ensemble.

The YouTube star wore a high-necked black crop top that barely revealed her underbust and paired it with a black mini skirt.

She slipped three belts with different rivets and eyelets over the fitted micro skirt.

Layering the outfit, the media personality wore a leather motorcycle jacket and matching knee high boots.

She wore a pair of oval sunglasses, large hoop earrings and a mini purse.

So Y2K: Tana Mongeau, 24, was also spotted posing outside of the venue in a proper Y2K ensemble with a high-necked black crop top that barely showed her underbust paired with a black miniskirt

So Y2K: Tana Mongeau, 24, was also spotted posing outside of the venue in a proper Y2K ensemble with a high-necked black crop top that barely showed her underbust paired with a black miniskirt

Contemporary and stylish: Christine Chiu was spotted on arrival in a cream modern top with assorted gloves adorning the sleeveless garment;  The producer and star of Bling Empire paired the look with cream pants and nude platform shoes

Contemporary and stylish: Christine Chiu was spotted on arrival in a cream modern top with assorted gloves adorning the sleeveless garment; The producer and star of Bling Empire paired the look with cream pants and nude platform shoes

Christine Chiu was seen on arrival in a cream modern top with assorted gloves adorning the sleeveless garment.

The producer and star of Bling Empire paired the look with cream pants and nude platform shoes.

The co-owner and founder of Beverly Hills Plastic Surgery carried a gold clutch and accessorised with large diamond earrings.

As for makeup, she looked rosy and radiant in a bright pink monochromatic makeup look.