Audrina Patridge sports a hot body at NASCAR Sprint Cup Series

Audrina's recent pics at the races are not to be confused with racy pictures of Audrina.

The Hills star is a well-known advocate of the track and dwas spotted on Sunday partaking in the Pepsi 500 event, part of the NASCAR Sprint Cup Series.

Audrina did her part for fans by posing with the green-means-go flag and, according to onlookers, was dressed to impress.

The Hills gal reportedly sent boy hearts racing when she pranced around the Auto Club wearing a tight, gray top and black leater pants with heel-high, black boots.

From the track rounds to the beach, the Into the Blue star wasn't just all about fun over the weekend.

Audrina joined others on a mission to protect the waters of the coast at the 25th Anniversary Surfrider Foundation Gala in Cali.

Despite Audrina telling OK! Magazine that its hard for her to keep up with a diet and exercise routine, the star looked amazingly fit and put together at both appearances.

"I’ve been training with a trainer," she says. "We had a routine, but now we don’t have time," Audrina told the mag. 

"We were on a strict diet that the trainer gave us, but I couldn’t stick to it. I need food or I get really bitchy and light-headed."

What does work for Audrina is making a diet and exercise regimen work in with her already busy schedule.

“I order what I want when I’m out, but I don’t eat all of it," she says.

”When I’m 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.”

For more stories on hot and fabulously fit celebrities...