The 26-year-old star donned a tiny blue two-piece which showed off her incredibly flat stomach and muscular physique as she enjoyed herself during her vacation in Cabo San Lucas.
Audrina has become famous for her beach-ready body since appearing on MTV reality show The Hills, and is now more often than not seen wearing a tiny two-piece on her own reality show Audrina.
Bikini babe: Audrina Patridge shows off her flat stomach and muscular physique on holiday in Mexico
But maintaining her figure doesn't come easy, and Audrina has to stick to a strict exercise regime.
She said recently: 'You know I do certain things to work out and tone my arms and abs and butt… the stair climber and just lifting weights and going to Runyan Canyon and hiking or swimming and dancing.'
And Audrina admitted there isn't a minute she doesn't think about working out and exercising her body as best she can.
Good spirits: The reality star appeared to be enjoying herself, basking in the sunshine and laughing with friends
Snap happy: Audrina giggled as she took a photo of a friend on her iPhone
She said: 'Even when I'm just sitting in front of the TV, I lift five-pound weights or do squats. And I wear heels when I vacuum, because it works my calves and my butt!'
But it's not only about the working out, as Audrina also has to watch what she eats to stay as healthy as possible.
She said: 'I order what I want when I'm out, but I don't eat all of it. I am not really big on sweets. I don’t like dessert. I don’t like certain kinds of candy I’m not a big chocolate fan.'
Audrina certainly appeared to be enjoying herself on her sunshine break over the weekend, basking in the sunshine and laughing with friends.
Ready for action: Audrina looked cute in a pair of beige trousers and red hat as she took a polo lesson
'Real chemistry': Audrina appeared to have hit it off with her polo instructor as she picked up the sport
One person who seemed to be absent from the holiday, however, was Audrina's on-off boyfriend Corey Bohan.
And, in the most recent episode of Audrina's show, the Hills star indulges in some flirting with her polo teacher after undergoing lessons in the horseback sport.
The heat between Audrina and her teacher must have been palpable as well, as her stylist friend Joey commented that the pair have 'real chemistry'.
-via Daily Mail