Today the curvaceous blonde is staring international mega-stardom in the face and is feted as the next Elle Macpherson or Claudia Schiffer.
In her modelling heyday Ms Macpherson was known as 'The Body', and it's a sobriquet which would not be out of place attached to Kate Upton's fabulous 33D-25-36 curves.
It's is little wonder she's becoming the world's most sought-after swimwear and lingerie model.
The 5ft 10ins stunner turned to the catwalk after huge success as a young horsewoman, winning five world titles.
But her career was relatively modest until earlier this year when she modelled for Sports Illustrated's famous swimwear issue, and picked up the title 'Rookie of the Year'.
Her career went stratospheric. High-profile, and big money, job offers poured in and her Twitter following soared from just over 2000 to just under 100,000 in two weeks.
As if to cement her position as a very senior 'internet babe' an unremarkable YouTube video of Ms Upton attempting a hip hop dance called the Dougie has been viewed almost 1.5 million times.
See if you think Kate Upton has what it takes in out gallery below.