USUALLY seen with bottle of champagne in one hand and a long-limbed model on the other, Leonardo DiCaprio is still owning his title as the world's longest-reigning Lothario.

The 43-year-old actor - worth a staggering £190million - is renowned for his lavish partying ways and is often pictured leaving nightclubs swamped by a bevy of 20-something-year-old beauties.

13 The Hollywood heartthrob appears to have a thing for models Credit: Splash News

The Titanic star is currently dating Al Pacino's step daughter, Camile Monroe - who at 23 is two decades younger than him.

But Camile isn't the first 20-something model the Wolf of Wall Street star has dated.

In fact, ever since his first high-profile fling with Vogue cover girl Bridget Hall - then 20 back in 1994, he's failed to date anyone over the age of 25.

13 Leonardo DiCaprio spotted with his current girlfriend Camila Morrone enjoying a walk in the West Village in New York Credit: Splash News

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But why after 20 years is Leo still only dating models in their 20s - and why is his cut off age for a girlfriend 25?

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The curse of 25

It was when Leo himself was 25 when he faced his first negative press story.

While filming The Beach in Thailand, he was accused of damaging the environment and getting a co-star pregnant by the Thai tabloids.

At the time, the previously clean-cut star said it was a "stab on my reputation."

"This is something I probably have to get used to - lies culminating in something much more hysterical and out of hand."

13 Leo has dated a string of beauties - but none above the age of 25

And experts believe that Leo's experiences when he was 25 may have stopped him wanting to date anyone older.

Andrea Lindsay from Click For Therapy told Sun Online: "It is possible that DiCaprio’s negative experiences at 25, may have subconsciously scarred him.

"This was the first time he had been seen in a bad light, resulting in him trying to return to his younger, happy-go-lucky days."

13 The Wolf of Wall Street star was also linked with British model Naomi Campbell Credit: Getty - Contributor

Psychotherapist Noel McDermott agrees.

"Leo may feel like the trauma of the event meant he should only date someone of the age he was when this happened," he says.

"It may also be a rationalisation for something else.

"Clearly this isn’t healthy behaviour - not so much the age differences but the repetitive nature of the relationships - it indicates a serious problem with forming intimate relationships.

"His pattern of dating suggests he is avoiding a mature relationship that can challenge him to be authentic and vulnerable."

13 Leo with model Kristen Zang in 1996 Credit: Getty - Contributor

13 Leo and Gisele dated for almost five years Credit: Getty Images - Getty

Scared of being used by actresses wanting to 'get to the top'

Throughout his entire adult life, the 43-year-old has been linked to the biggest names in fashion - from Naomi Campbell and Gisele Bundchen to Kristen Zang and Toni Garn.

Blake Lively is the only one of his 13 girlfriends who isn't a model - though she easily could be.

The Romeo and Juliet actor had a fling with model Amber Vallerra, 24, after he saw her in a magazine and had his reps track her down.

DiCaprio gets crotch hugged

13 He has been dating Camila Morrone since last year Credit: Getty - Contributor

He then enjoyed a five-year romance with Giselle Bundchen, but the pair split just after her 25th birthday.

He moved on to dated Blake Lively when she was 23, and the following year in he romanced Erin Heatherton who was 23 at the time.

Psychologist Nicole Gehl from London thinks Leo purposely dates young models because they can't have an impact on his career - or use him to get ahead.

She tells Sun Online: "He might be wary of an upcoming actress using him as a building block for their career - so date models instead."

The need to be desired

Lindsay thinks Leo may be obsessed with dating younger models because he needs to feel desired.

"Perhaps this issue is not about what happened to him at 25, but more about what being 25 represents, as opposed to being 43," she tells Sun Online.

13 Vogue covergirl Bridget Hall was the first model Leo dated Credit: Getty Images - Getty

"At 25, we have our life ahead of us and youth on our side without the responsibility and expectation that comes with age."

Lindsay goes on to say that dating younger women can be an outward statement of confidence and virility.

13 Leo and Toni Garn dated for 18 months Credit: AP:Associated Press

"Dating a woman his own age would become a mirror of his own mortality - and perhaps one he does not want to accept?

"A man's self perception is based upon his current level of attraction - so if he wakes up next to a 25 year old, he can believe he has maintained his youth.

"Younger women may be more easily pleased by gifts and goods whereas someone closer to his own age may want what he is not ready to give - commitment and children.

"As the saying goes “A man is as young as the woman he feels”!

Margot Robbie teases Leonardo DiCaprio in The Wolf of Wall Street

Blinded by beauty and using women as trophies

Psychologist Toby Ingham believes DiCaprio is starstruck by the models' beauty in the short-term but ultimately craves somebody he can be honest and real with.

He said: “In the short term their beauty is probably is all that you need or all that you think you need to think about.

13 Leonardo DiCaprio and girlfriend model Toni Garrn enjoying their holiday in Mallorca Credit: Vantage News

“But in the longer term it’s probably the case the beauty alone is not enough to sustain a relationship.

He added: “I imagine his mother may have been very supportive and he has a very good relationship with her and she may be one of the very few women he can turn to and be honest in a world so saturated with celebrity.

"He lives in such a pressurised, A-list celebrity bubble that it’s very difficult to meet people who are not in it too."

“He’s not going to be bumping into women at the book shop or at the Co-Op in High Wycombe.”

13 Leo dated actress Blake Lively for a brief period and she is the only actress he has been linked to Credit: Getty - Contributor

His one true love

Despite DiCaprio having the choice of a number of girls, he often brings his mum Irmelin Indebbirken, a German born legal secretary, to award ceremonies - rather than his latest squeeze.

13 Leonardo attended the Golden Globes Awards with his mum back in 1994 Credit: Getty - Contributor

The A-lister previously said his German-born immigrant mother was his ideal women yet he has dated nearly 50 supermodels since becoming a household name.

The 43-year-old previously said: “My mother is the centre of my life. To have a woman like that in your life, who is strong, who'll be honest with you about who you are... that's something I treasure.

“And it's something I look for in a woman.”