When you’ve got a body like Audrina Patridge’s, there’s only one way to celebrate your birthday: poolside, in a teeny bikini! The 26-year-old star of a self-titled VH1 reality show partied and flaunted her enviable bod at MGM Grand’s Wet Republic in Las Vegas on May 14. And even with a busy schedule — she’s been filming Audrina, shooting a sexy calendar, making loads of red-carpet appearances and dealing with family drama — she still finds time to stay in shape.

In the gallery, Audrina spills her secrets.

6 photos in the gallery