Pumped up: Paris Hilton's muscular physique down to new bodybuilder's diet



She's the slender blonde heiress to a multi-million dollar fortune who's become one of the most famous faces on the planet with her reality TV shows as well as lines of fragrances, make-up and clothing.

But it appears we're going to be quite literally seeing even more of Paris Hilton in the future, because her 35-year-old boyfriend Cy Waits introduced her to bodybuilding - and her thighs and biceps are already bulging.



The 29-year-old showed that the regime her fitness fanatic boyfriend has got her on is working already when she paraded down the catwalk at a Sao Paulo fashion show last week and had onlookers gasping at her muscular new figure.



Pumping iron: Paris Hilton has started body building under the instruction of boyfriend Cy Waits and the results were obvious in Brazil last week

Now and then: Paris Hilton strutted her stuff on the catwalk in Brazil showing off a bulkier figure compared to her bikini body in July



The usually super-slim socialite has apparently been on a 3,500 calories-a-day diet coupled with a high-intensity cardio and weight-lifting regime to change her body shape.



The star has supposedly now caught the body-building bug too, so she could have a physique to put a shotputter to shame in no time.

Not so healthy though is the news that according to this week's Grazia, the star has also been indulging on weekly fast food binges at the likes of Taco Bell and McDonalds - her treat for doing so much exercise.



She's even drinking body-builders' protein shakes in a bid to add muscle to her previously stick-thin frame.

Model moves: Paris strode down the catwalk in outfits by fashion brand Triton

Leader of the pack: Paris lead the final parade as the fashion show closed

Her appearance was in stark contrast to the Paris that soaked up the sun in a pink stripey two-piece in St Tropez, back in July.



The star strutted her powerful new figure proudly as she showed off a host of chic designs, which included a black dress with pleated skirt and bright trim.



Her hair meanwhile was in a French plait on the side of her head revealing a much plumper face than usual.

Jet setters: Paris an boyfriend come-personal-trainer Cy jetted into Brazil together

Paris closed the show as the lead model and wore a stunning strapless metallic dress teemed with huge platform heels.



She tweeted: ‘Just finished walking in the @TritonLovers Runway Fashion Show. The show went amazing! The clothes were so beautiful! Loves it! Brazil rocks’



Boyfriend Cy is said to love Paris's new curves too. A friend told Grazia: 'She wants to change her image and get properly healthy. At first she was unsure and it took some time getting used to, but now Paris loves her new body. And Cy loves it too - he's always talking about how hot and gorgeous it is.'