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SIBLING rivalry can be fierce - but imagine if your brother or sister was a world famous celebrity?

That’s the case for Aydan Nix, the secret half-sister of Bella and Gigi Hadid, who only met her supermodel siblings for the first time less than two years ago.

Woman in tan top and denim shorts standing in doorway.
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Aydan Nix is Bella and Gigi Hadid's 23-year old half sisterCredit: Instagram/toospoiled
Bella Hadid and three friends in bikinis on a beach.
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The supermodel sisters met their sibling for the first time less than two years ago and have since become close friendsCredit: Instagram/toospoiled

Her mother had a brief romance with Bella and Gigi’s multi-million dollar property tycoon dad Mohamed, but Aydan’s connection to the family was kept under wraps for more than two decades, with her father not providing financial support.

Aydan, 23, grew up in Florida with a different man whom she believed was her father, until he died when she was 19, prompting her to take a DNA test and discover she was in fact a Hadid.

The sisters confirmed on Thursday that they’d met their half-sister, saying they have "cherished this unexpected and beautiful addition to our family”.

Adyan’s case is pretty unusual, in that she had no idea of her showbiz connections until recently, and with her striking looks it wouldn’t be surprising if she too began to carve out a star profile of her own.

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Snaps of the trio show them frequently enjoying trips to the beach together and nights out in swanky New York City nightclubs.

But other siblings of famous stars often prefer a life out of the limelight, happy to live in their relative’s shadow.

Here we reveal the secret celebrity brothers and sisters you probably had no idea existed.

Chloe Delevingne 

Her youngest sister Cara is one of the most famous supermodels and actresses in the world, while her other sister Poppy, 11 months her junior, has also made waves on the catwalk for brands like Marc Jacobs and Louis Vuitton.

But there's no doubt Chloe Delevingne, 39, is the brains of the family.

While her sisters were posing up a storm, Chloe was studying biomedical science and tumour biology at the illustrious University College London.

Bella Hadid’s see-through dress was ‘shocking’ for ‘sophisticated and elegant’ Cannes – she ‘should’ve dialed it down’
Chloe, Cara, and Poppy Delevingne at a launch event.
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Chloe, Cara and Poppy Delevingne make quite the glamorous trioCredit: Getty
Chloe Delevingne at The Lady Garden Gala.
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While her siblings made their name on the catwalk, Chloe, 39, was studying hard at a top universityCredit: Getty

Chloe used her medical background to co-found the Lady Garden Foundation charity, which aims to raise awareness for gynaecological health.

She's also been training to become a midwife, telling Cotswold Life in July 2023: “It’s hard but good and very rewarding.

“I think if you can help any woman when she is at her most vulnerable to have the birth she wants then there’s a lot to be gained.”

The three sisters also launched a vegan prosecco brand together in 2020.

The Gallagher Sister

Promotional photo of Noel and Liam Gallagher.
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Noel and Liam have a half-sister they've reportedly refused to meetCredit: Instagram/Oasis
A father and daughter embracing.
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Emma Davies with her dad Tommy - who is the father of the Oasis starsCredit: Matthew Pover
Liam Gallagher and his mother leaving a hospital.
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Emma was born after Tommy had an affair while married to Liam and Noel's mum Peggy (pictured)Credit: PA

Given the Oasis brothers have only just managed to make it up with each other, it might not come as a surprise that they don’t have the best relationship with their secret sister, who grew up round the corner in Burnage, Greater Manchester.

Emma Davies, 51, was born just months after Liam in the very same hospital.

She shares their dad , who had an affair with Emma’s mother June.

Despite this, the Oasis rockstars have reportedly refused her attempts to make contact and have never met each other.

“I would like to meet them. Obviously you’re going to want to meet your brothers,” she previously told MailOnline.

It was her buying the album (What’s the story) Morning Glory that prompted Emma's mum to tell her the truth about who her father was.

“When she... saw the CD she said, ‘I think you’d better sit down, I’ve got something to tell you.’ I was completely flabbergasted,” Emma recalled.

She last met her father in 2006 when she was 32, but his unstable nature quickly led them to become estranged again.

The Oasis bandmates have also been estranged from their father for years, with Noel saying in 2019 his dad “doesn’t mean anything to me”.

The Oasis rockers also have a lesser-known older brother, Paul Gallagher, who keeps out of the spotlight but has a close bond with them both.

He revealed in a recent interview: “I speak to the pair of them. I see Liam every other day."

He has previously opened up about the pair's infamous public rift, saying: "I do my own thing, I stay away from it as much as humanely possible."

The Osbournes - plus one

Photo of Ozzy Osbourne and his family.
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Viewers could be forgiven for thinking the Osbournes are a family of fourCredit: Handout - Getty
Aimee Osbourne at SiriusXM Studios.
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Older sister Aimee instead chose to avoid the limelight that came with the TV show, but did follow in her father's footsteps with a career in musicCredit: Getty

The Osbournes essentially paved the way of the Kardashians with their no holds barred, fly-on-the-wall reality show back in 2001.

But while Sharon and Ozzy's kids Kelly and Jack welcomed the MTV crew into their lives, their older sister Aimee decided to opt out.

At 16 she moved out of the family home, though later confessed she would have liked to stay a “little longer”.

“Back then, I still felt I was trying to figure out who I was in the chaos of family life, so why on earth would I want that portrayed on television?” she said.

She doesn't understand me and I don't understand her

Kelly Osbourne

Now 40, she still keeps her private life under wraps, and has been dubbed the “hermit” of the family.

She has, however, followed in her father’s footsteps with a career in music, and is currently lead singer of pop band ARO.

She isn't exactly close with her sister, with Kelly telling the Dax Shepard podcast in 2023: “We don’t talk... We’re just really different. She doesn’t understand me and I don’t understand her.”

Aimee has echoed that sentiment. “I wouldn’t say there is an ease between us, but there is an acceptance,” she told The Independent. “Do we socialise? No.”

Fortunately she gets on well with her other sibling Jack - and together they're planning to produce a biopic all about their famous parents.

The third Strictly sister

The three Mabuse sisters, Oti, Motsi and much lesser-known Phemelo
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The three Mabuse sisters, Phemelo (left), Motsi (middle), and Oti (right)Credit: Instagram
The three Mabuse sisters, Oti, Motsi and much lesser-known Phemelo
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Each time the sisters post together on social media, fans are left stunnedCredit: Instagram

Strictly Come Dancing sisters Oti and Motsi Mabuse have revealed they have a secret third sister - who is the "best dancer" of them all.

Their sister Phemelo, 39, who is the middle child of the family, keeps away from the limelight as she works as a mechanical engineer in South Africa.

Nonetheless, the third sibling shares her sister's dancing abilities, keeping a toe in the professional dance world and competing at the World Dance Championships.

Oti revealed on the Jonathan Ross Show: "To be honest, we have another sister, middle sister, she was the better dancer.

"She's a mechanical engineer. She designs windmills which create electricity through wind in South Africa.”

The siblings do occasionally post pictures together, however, and in their rare Instagram appearances, fans can't believe how similar the three are.

Oti remarked that they all have the “same nose” as one fan gushed they also have the “same lips” and complimented them all as "beautiful".

Scarlett Moffat

Two sisters celebrating a birthday with cocktails.
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Gogglebox star Scarlett Moffatt first hit the screens when she was 18Credit: instagarm
Woman in pink fringed jacket and cowboy boots celebrating her sister's 18th birthday.
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Her younger sister Ava is now studying archaeology at universityCredit: instagarm

Famous on the telly for... watching the telly - there's almost an Inception-like feeling to Gogglebox.

Out of all its ordinary people turned stars, Scarlett Moffatt is arguably the most famous of them all, especially after being crowned Queen of the Jungle following her stint on I'm A Celeb.

While we've been watching her with parents Mark and Betty since she was 18, few will be aware Scarlett, now 34, has a younger sister, Ava, who is 15 years her junior.

Fans did get a glimpse of Ava - now aged 18 and studying archeology at university - in season seven of Gogglebox.

Scarlett has previously gushed over their close relationship despite the significant age gap, posting on her birthday: "Watching you grow up into the amazingly kind, intelligent, beautiful, bloody hilarious lady has been a blessing."

The fourth Jonas Brother

The Jonas Brothers backstage after Nick Jonas' Broadway debut.
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The Jonas trio made their name while brother Frankie was still youngCredit: Getty
Frankie Jonas at the 60th Academy of Country Music Awards.
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Frankie is looking to follow in their footsteps and has now launched his own music careerCredit: The Mega Agency

Joe, Nick and Kevin together make up one of the most famous trios in pop music.

But did you know that they could have been a quad?

That’s because they in fact have another brother, Frankie, who himself is a singer.

He’s also had some success as an actor, though nothing on the scale of his Camp Rock siblings.

The 24-year-old launched a music career in 2023, and has since released two singles. 

And in typical Gen Z style, he’s also starting to make a splash on TikTok.

So could three become four? It might only be a matter of time.

Doug Pitt

Digitally manipulated image of Brad Pitt and his brother Doug.
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Brad Pitt's younger brother Doug went on to become a businessman in the world of software and computingCredit: BEI
Doug Pitt smiling on the Today Show.
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Doug has played up the fact that he's the less-famous siblingCredit: Getty

You might think being Brad Pitt’s brother dooms you to a life as second fiddle.

Fortunately his younger sibling Doug, has enjoyed plenty of success in his own right - just in an industry that’s a lot more low-key than Brad’s.

The 58-year-old, who is married to wife Lisa and has three children, made a fortune of his own after selling a hefty stake of his computing company back in 2007.

He’s also a dedicated philanthropist, appointed the first ever Goodwill Ambassador for the United Republic of Tanzania in 2010 by President Jakaya Kikwete. 

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And there’s definitely no bitterness about having such a huge star as his older brother.

In fact, he's even starred in a Virgin Mobile Australia advert portraying a comedic version of Brad as “The Second Most Famous Pitt”.

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