This massive Hollywood star just shared a childhood photo with her younger sister to wish her a happy 40th birthday on Instagram on Thursday.

The ladies were seen as young, privileged children photographed in pink and ivory during a costume birthday party in Beverly Hills.

The older sister – seen here with a tiara and magical silver wand – is a blonde bombshell pinup who is friends with the Kardashian and Richies.

She came to fame with a reality TV show then became a red carpet fixture. Now she works as a DJ and is a perfume mogul.

Her younger sister is a fashion plate, and style author who lives in NYC with her old money husband and their three kids.

Who are they?

Can you tell? This massive star just shared a childhood photo with her younger sister to wish her a happy 40th birthday on Instagram on Thursday. The ladies were seen as young children photographed in pink and ivory at home in Beverly Hills

Can you tell? This massive star just shared a childhood photo with her younger sister to wish her a happy 40th birthday on Instagram on Thursday. The ladies were seen as young children photographed in pink and ivory at home in Beverly Hills

Can you tell? This massive star just shared a childhood photo with her younger sister to wish her a happy 40th birthday on Instagram on Thursday. The ladies were seen as young children photographed in pink and ivory at home in Beverly Hills

They are Paris Hilton, 42, and Nicky Hilton.

Nicky turned 40-years-old on Thursday.

And Paris was quick to take to social media to wish her well with the childhood snap.

Her note was sweet. 

‘To my forever partner-in-crime, my confidante, and my beautiful sister. Growing up alongside you has been the most incredible journey.

‘From our childhood adventures to our adult dreams, every moment with you has been nothing short of magical. 

‘On your special day, I’m reminded of how lucky I am to have a sister who shines so brightly both inside and out. Your grace, strength, and beauty inspire me every day. 

‘Here’s to celebrating not just the wonderful person you’ve become, but the countless memories we’ve made and the many more to come. Happy Birthday, my dearest sister. May your day be as radiant and unforgettable as you are. ✨Love you!’ 

Nicky celebrated with a party in Paris as she posted the fun images to Instagram after hitting several fashion shows with her older sibling.

The 365 Style author was seen in a black sparkly mini dress with her hair back as she sat on a glass-top coffee table next to several birthday cakes.

‘Could not have asked for a better birthday week in the best city with my best friend! Most epic sisters trip! ❤️’ she said of spending time with Paris in France.

Party people: They are Paris Hilton, 42, and Nicky Hilton . Nicky turned 40-years-old on Thursday. And Paris was quick to take to social media to wish her well with the childhood snap. At the Stella McCartney show during Paris Fashion Week Womenswear Spring/Summer 2024 on October in Paris

Party people: They are Paris Hilton, 42, and Nicky Hilton . Nicky turned 40-years-old on Thursday. And Paris was quick to take to social media to wish her well with the childhood snap. At the Stella McCartney show during Paris Fashion Week Womenswear Spring/Summer 2024 on October in Paris

Party people: They are Paris Hilton, 42, and Nicky Hilton . Nicky turned 40-years-old on Thursday. And Paris was quick to take to social media to wish her well with the childhood snap. At the Stella McCartney show during Paris Fashion Week Womenswear Spring/Summer 2024 on October in Paris

She is 40!  Hilton turned 40-years-old on Thursday. She posed with her cakes in France

She is 40!  Hilton turned 40-years-old on Thursday. She posed with her cakes in France

She is 40!  Hilton turned 40-years-old on Thursday. She posed with her cakes in France

The star – born Nicholai Olivia – is the wife of James Rothschild of the famous Rothschild family. He is a grandson of Victor Rothschild, 3rd Baron Rothschild. 

In May, Nicky, a mother of three, opened up to E! News on the advice she gave to her sister Paris, who welcomed her first child via surrogate.

‘My advice always is to not miss the small moments. There’s such a short window that they’re so small, and new things are happening every day,’ Nicky said. 

‘Like, Paris always says her son looks different every day,’ Nicky said, adding, ‘She is so happy. She’s so content.’

‘I was just over there last week and just hanging out in the nursery with her and her son, and she’s so complete is the word I’d use,’ she continued.

Nicky added that Paris’ son Phoenix, ‘looks a lot like me as a baby, and my daughter Lily-Grace looks identical to Paris as a child.

‘So, it’s interesting how the genes crossed like that,’ she said, adding how interesting it is that she grew up in a family of mainly girls while she, her sister and brother Barron have all had boys.

‘Funny, we had all girls in the family and, in the last year, my brother had a son, Paris had a son and I had a son,’ Nicky said.

‘So, we’ve been flooded with boys, and it’s amazing to see the bond between them,’ she added.

Meanwhile, her sister Paris has been ‘on cloud nine’ since becoming a mother, according to Nicky who has opened up about her sibling’s journey to parenthood after Paris dropped the bombshell news about welcoming son Phoenix Barron with her husband Carter Reum via surrogate back in January – and Nicky is adamant the DJ is doing a brilliant job in the first few months of her new life.

Wow factor: Hilton arrives on the red carpet at the 2023 Latin Billboard Music Awards at the University of Miami, Watsco Center, Thursday

Wow factor: Hilton arrives on the red carpet at the 2023 Latin Billboard Music Awards at the University of Miami, Watsco Center, Thursday

Wow factor: Hilton arrives on the red carpet at the 2023 Latin Billboard Music Awards at the University of Miami, Watsco Center, Thursday

She told PEOPLE: ‘She is on cloud nine. She is such an incredible mother. She was born to do this, and I’m just so happy for her.’ 

Nicky is mum to three kids – two daughters and a son – with her husband Rothschild and she hopes the youngsters will be close to their little cousin once they finally get to meet him.

She added: ‘I’m just so excited for all the cousins and babies to be together. They haven’t all met yet. When my kids have spring break in a few weeks, they’re going to come here and meet their new cousin.’

Paris recently revealed she has undergone further IVF treatment in a bid to have a second child – and she wants the baby to be a girl.

In an interview with Glamour magazine, she explained ‘We’ve done it [the IVF process] seven times… I have all boys [embryos]. I have 20 boys.’

She then revealed the latest round of IVF took place earlier this year and they are waiting to see if it has been successful. Paris added: ‘I just went through the process again a month ago, so I’m waiting for the results to see if there’s any girls.’

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