1 of 15
15. Vegas Baby!
Getting the party started early, headed to Sin City this weekend, where she has a pre-birthday (the starlet turned 25 on May 9!) drink poolside in a fringe-topped bikini at the Aria Hotel and Casino’s Liquid Pool.
See more Hills coverage in TV Watch.
2 of 15
14. SOLID GOLD
Just call her Goldfinger! Audrina cements her golden girl status in a metallic halter suit while partying at the DKNY Jeans House in Malibu.
3 of 15
13. FASHION PLATE
Clearly Audrina’s picked up a tip or two about accessorizing from frenemy , adding on a straw hat, gold shades and a hot pink sarong to her striped suit in Mexico.
4 of 15
12. DOUBLE TROUBLE
Taking a break from being the bikini babe in the family, Audrina picks a monokini while sister Casey goes for a red-hot two-piece to accent her tattoos for some poolside antics in Las Vegas.
5 of 15
11. GOOD VIBRATIONS
Who needs exotic locales to flaunt it when Santa Monica is your backyard? Audrina does her best Baywatch jog in a neon bikini in the surf.
6 of 15
10. MESSAGE ALERT
Who could be interrupting her Hawaiian tanning session – Brody Jenner? Justin Bobby? Flaunting a body like hers, it’s no wonder the guys of The Hills are all texting for her attention.
7 of 15
9. AB OFF
Now we know the truth behind Audrina and Corey Bohan’s short-lived romance – she has better abs! Before their breakup, the buff couple cozied up on the shores of Mexico last summer.
8 of 15
8. ON THE CLOCK
Yes, she even goes to work in a string bikini! Audrina gets busy filming The Hills in Malibu in a itty-bitty polka-dot bikini.
9 of 15
7. LEG UP
There’s a reason they call it Sin City! Audrina gets in on the action – from the top – while partying the day away in a Vegas pool.
10 of 15
6. TIME WARP
Ahhh… the good old days! Remember when Audrina was just ‘s sidekick? In happier times, the former roommates catch some rays in their backyard in 2008.
11 of 15
5. EYE CANDY
Movie-star shades? Of course! Bikini? Obviously! Hundreds of admirers? Yup, it’s just another day in the Vegas sun for The Hills hottie as she sunbathes poolside at the MGM Grand Hotel and Casino’s Wet Republic.
12 of 15
4. CHEW ON THIS
Eat your heart out, Justin Bobby! Audrina is all about Carl – Carl’s Jr., that is – as she puts her bikini bod front and center in a gold two-piece while filming a commercial for the chain’s double-stuffed burger last summer.
13 of 15
3. GRIN AND BARE IT
L.A. in the summertime means one thing: pool party! Audrina makes a splash simply stepping out of the pool in a sexy two-piece in Malibu.
14 of 15
2. JUMP START
Let’s hope her top makes it into the pool with her! Taking the plunge in a pink string bikini, Audrina frolics at the DKNY Jeans Beach House in Malibu during the hot days of summer ‘08.
15 of 15
1. HELLO HOLLYWOOD
Ready to turn green with envy? Audrina – and her rock-hard abs – takes five on the Hawaiian set of Into the Blue 2: The Reef in 2008. When you look this good in a bikini, you deserve a break.
7 Ridiculously Affordable Swimsuits to Buy Now and Look Amazing in Next Year
So You Think You Can Glam! Behind Vanessa Hudgens' SYTYCD Looks
Ariel Winter Goes on Instagram 'Rant' About Her Clothing Critics: 'Screw Having to Look Appropriate'
Gossip Girl Is 10 Years Old! You Know You Love These 18 Outfits
Fashion Week Jets to London! See All the Can't-Miss Moments from Across the Pond