Just a year or so earlier, this latter-day Crocodile Dundee was running barefoot around his family's dairy farm in Australia and tearing about the bush on a motorbike.

Now Travis, 21, was on the verge of fame and fortune - but old habits die hard. As he walked into the offices of LA Models, he realised that he had instinctively slung his tatty trainers over his shoulder.

He needn't have worried. Model booker Paul Nelson cast a professional eye over the muscular torso topped with an angelic, boyish face - and signed him on the spot.

"He had a beautiful face, a very funny personality - it all clicked," says Nelson. "We helped him out with money and a place to stay. We believed in him from the beginning."

That was last April. The young man who used to milk cows to earn pocket money was months away from one of the biggest deals with Calvin Klein since Kate Moss made her name at the fashion house.

THE extremely well-endowed Aussie, now 22, is on a six-figure deal to front the underwear campaign that has sent ripples of desire and envy throughout the population.

Gazing down from a giant billboard in downtown New York, Travis is an Adonis clad in skimpy white briefs. His image is plastered on billboards and in magazines worldwide. A week ago, he was in London's Selfridges autographing underwear for fans.

But when he opens his mouth to speak, the words that come tumbling out are not in sync with his sex-symbol status. In his Aussie drawl, he says frankly of the huge poster: "I don't look at it, man." He is also quick to laugh off the idea of being an object of desire for many women - and some men, too.

"Can't take it seriously, mate. Embarrassing. Funny." Then with a cheeky smile, he relents saying: "It's good, it makes a lot of people happy."

There is no holding back the Aussie bluntness. He says of new boss Klein: "You'd think he'd be stuck-up but he's just so down-to-earth. He's rich as f***, though."

After appearing in a Jennifer Lopez video, he described the diva thus: "She's got a fat a*** but she's very nice." As for his instant success and the underwear shoots: "I felt like a p***k. I was very self-conscious I have to say, mate." Still, at least he did them. He once declared: "No way, mate, I'm not wearing jocks."

These days Travis has more "jocks" than he can use. Along with the year-long contract comes a supply of Calvin Klein pants: "I've got 500 pairs of them at home. I only have to wash about once every two months."

Travis grew up on his parents' remote farm 26 miles outside Echuca in Victoria. The youngest of three brothers, he worked on the farm and rode around on motorcycles and hunted foxes.

Proud mother Jenny says: "He would disappear and camp out for the night. Even now, he jumps on a motorbike and heads out to see what's been happening on the farm." She offers some insight into why her son is dismissive about his good looks: "He was small, the little guy, so it doesn't suit his character to make a big deal about his looks."

At 17, Travis moved to Melbourne to play football and study sport management at university. But hopes of a sporting career were dashed when he broke his leg.

It was while working out in a Melbourne gym that he was spotted by a talent scout from Peter Chadwick Model Agency.

Booker Matthew Anderson recalls: "He never saw himself as a star and I don't think he does now. He is either genuinely not aware of his appearance, or he's just playing it cool. It might be a mixture of both." Part-time modelling jobs took Travis from Melbourne to London. At 19, he dated then All Saint Nicole Appleton. But after a short affair, Travis dipped out of the limelight, dumping Nicole because she was "boring".

It was only a matter of time before he decided to try his luck in America. "Just to see the country," he says. "I keep saying: 'I am not a model, mate. It's just a job to make money to travel'."

After being plucked from obscurity by LA Models, the young Aussie found himself in close proximity to a number of leading ladies.

But his talent for speaking his mind appears to be almost as big as his talent for filling Calvin Klein's new Body Underwear line. He even describes playing the love interest in a Janet Jackson video as "cheesy". Today he lives in LA and is more likely to be found surfing the waves than trapped inside a gym: "I'm the most unhealthy person in the world."

Travis has also been spotted out with Hollywood beauty Meg Ryan, 40. The pair recently dined at Manhattan's Nobu sushi restaurant owned by Robert De Niro. They shared plates of raw fish and giggled like schoolkids.

But we'll have to wait to see whether a more mature woman can tame this wandering Aussie spirit. "Modelling is so boring," he confides. "It's meant to be glamorous but you sit there for ages.

"I don't have a clue what I'm doing. I might go home straight after this. I might go travelling again. My plan is to make a plan."