Demi Sims Age, Biography, and Career

Who Is Demi Sims?

There are reality TV personalities, and then there is Demi Sims — someone who has built a name entirely on her own terms. An English television personality, influencer, content creator, and now a professional boxer, Demi has carved out a multi-layered career that goes well beyond her famous surname.

She first caught public attention through her appearances on the beloved British reality show The Only Way Is Essex, more widely known as TOWIE. But it is her openness, her personality, and her willingness to live authentically in the public eye that have kept fans genuinely invested in her journey.

Demi Sims is also part of one of the most recognisable families in British reality television. She is the younger sister of Chloe Sims and Frankie Sims, and the cousin of fan-favourite Joey Essex. Family, it is fair to say, has always been at the centre of her story.

Demi Sims Age and Birthday

Demi Sims was born on 6 September 1996, which makes her 29 years old as of 2025. She was born under the Virgo zodiac sign and hails from Havering, Essex, England.

For anyone searching how old is Demi Sims — the answer is 29. She will turn 30 in September 2026, marking a milestone decade since she first stepped in front of the TOWIE cameras as a teenager. Demi Sims age has been a frequent point of confusion online, with several older articles listing her as 27 or 28 due to outdated publication dates, but the correct and current figure is 29.

Early Life and Family Background

Demi grew up in Essex, England, in a household shaped heavily by sport, ambition, and a tight-knit family bond. Her father is Tony Sims, a professional boxing trainer and promoter who has worked with some of the biggest names in the sport. Tony Sims and his brother Peter Sims are well known in the boxing world, having reportedly trained the likes of Conor Benn and Anthony Joshua.

Demi’s eldest sister Chloe Sims was one of the original TOWIE cast members, with her other sister Frankie and brother Charlie also linked to the show. Demi is also the cousin of Joey Essex.

Demi spent most of her childhood in Essex, until her family relocated to Los Angeles, California when she was a teenager. That move would later become the backdrop for the family’s own reality show.

When it comes to her education, specific details about her educational background are not publicly disclosed. Her mother’s identity also remains private — Demi has chosen not to speak about her publicly, and that decision is respected here.

TV Career and Rise to Fame

Demi Sims began her professional career working as a makeup artist, then pursued a modelling career before trying her hand at acting. Her television break came when she joined the TOWIE cast.

From 2014 to 2021, Demi shared the screen with her siblings in The Only Way Is Essex, appearing in 66 episodes of the show, which airs on ITV2 and ITVBe. Her storylines were often some of the most discussed, particularly her candid conversations around her identity and family relationships.

2019 saw Demi appear in 10 episodes of Celebs Go Dating, which aired on E4 and follows a group of single socialites as they find true love through a dating agency. That same year, her on-screen romance with Megan Barton-Hanson became one of the most talked-about moments of the series.

She has also made appearances on CelebAbility (2020), Dinner Date (2020), Eating with My Ex (2021), and Celeb Ex in the City. Each appearance added another dimension to her public profile.

In 2023, Demi joined her siblings for House of Sims, a family-led reality show that documented life in their new American chapter. And by 2024, she began guest-appearing on Made in Chelsea after striking up a romance with Jazz Saunders.

Personal Life and Relationships

Demi Sims is openly bisexual — she came out in her late teens and has spoken about her identity freely ever since. She was described in 2020 as one of the very few openly bisexual women in mainstream reality TV.

Her relationship history has been well-documented. Among her notable past partners are Leonie McSorley, Megan Barton-Hanson (whom she met on Celebs Go Dating), Francesca Farago, and Eve Gale.

So, who is Demi Sims dating now? Demi Sims is currently in a romantic relationship with Jazz Saunders, a star from the reality series Made in Chelsea. The couple began dating in March 2025 and confirmed their relationship publicly by sharing affectionate moments on social media and during public appearances.

As for Demi Sims’ partner, Jazz Saunders has become a regular presence in her public life, and the relationship has been warmly received by fans of both shows.

Health — Living with Vitiligo

Away from the cameras, Demi has shown real courage in speaking about her health. She has openly discussed living with vitiligo, a condition that causes loss of skin pigmentation, and has used her platform to raise awareness about it.

Her candour on the topic has resonated with a wide audience, turning what could have been a private matter into a positive conversation about self-acceptance and visibility.

Boxing Career

One of the most unexpected and exciting chapters in Demi Sims’ story is her step into the boxing ring. She made her debut at Misfits 22 in August 2025, where she beat Nadeshi Hopkins by unanimous decision over four rounds at Manchester Arena.

The decision to box was deeply personal. Ahead of her debut, Demi trained with her father Tony. In an emotional Instagram post, she wrote: “Never did I expect at the age of 28 to sit you down and ask you to coach me for my first fight with no personal knowledge of being in the ring.”

She added her thanks to him for being her biggest supporter, her role model, and her coach both in and out of the ring. For a woman who grew up watching her father shape champions, stepping into the ring herself was clearly a deeply meaningful experience.

Social Media and Brand Work

Demi Sims is highly active across social media, particularly on Instagram and TikTok, where she shares content ranging from lifestyle and fashion to personal moments. Her following has grown steadily alongside her career, and she has leveraged that audience into a number of brand partnerships.

She has worked as a brand ambassador for Fashion Nova, Skinny Food Co., Hotel Chocolat, and several other brands. She is also a content creator on OnlyFans, which forms part of her broader income strategy.

Demi Sims Net Worth

Demi Sims has an estimated net worth of approximately $1.9 million, with her income derived from various ventures including her appearances on reality television shows such as TOWIE and House of Sims, brand collaborations, and social media. Some estimates place the figure closer to $2 million, though all such figures should be treated as approximations given the nature of personal earnings data. What is clear is that she has built a genuinely diverse income base across TV, digital, and brand work.

Demi Sims Height and Physical Appearance

Demi Sims stands approximately 5 feet 6 inches (168 cm) tall, a height that complements her confident and charismatic presence both on-screen and in public appearances. She is widely known for her glamorous, fashion-forward style, which she showcases regularly across her social media platforms.

Quick Facts About Demi Sims

Conclusion

From her early days as a fresh face on TOWIE to becoming a multi-platform personality and making her professional boxing debut, Demi Sims has consistently refused to stand still. She has navigated fame, relationships, and personal challenges with a transparency that has won her a loyal fanbase.

With a growing presence on social media, a confirmed relationship with Jazz Saunders, and a first boxing win already under her belt, 2025 looks like one of her most exciting years yet. Anyone still asking who is Demi Sims is about to find out — she is just getting started.

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