Audrina Patridge and Heidi Montag
Jen Lowery/Startraks; Bruce Gifford/FilmMagic
08/31/2009 at 02:00 PM EDT
She may be all for supporting her friends on The Hills
, but when it comes to cheering on the budding musical career of Heidi Montag
, Audrina Patridge
isn't exactly her costar's No. 1 fan.
"I feel like Heidi, you know, she's doing it for fun, where a lot of singers and people, they work their ass off, and they actually have amazing voices and they can really sing and perform, and I feel like a lot of people don't get to experience what Heidi has, going on in front of a billion people and perform on TV," Patridge told PEOPLE while promoting her new movie Sorority Row
over the weekend. "I just don't think she's taking it that serious, and that's what's kind of disappointing for me, for music lovers out there."
But the 24-year-old beauty – who says Montag's Miss Universe performance was "very Britney Spears-like" – has plenty of positive opinions about her own foray away from reality TV and into acting for the silver screen.
"On the movie, I went to my acting coach twice a week and I memorized all the lines," she says of appearing with Rumer Willis
in the slasher flick Sorority Row
. "On The Hills
, you show up for an hour and say what you want then leave."
Of course, embracing the Hollywood life also means having to deal with some fairly outlandish rumors about herself.
"[They say] that I was pregnant. Another one, that I got a nose job, that I got a chin job, cheek implants, I mean my whole face," she says of false reports about herself. "You know sometimes, when they stick a video camera in your face and they try to provoke you with questions that are just really … sometimes I get like, 'What are you talking about?' But I'm very lighthearted and I just try not to take things too serious."
And it helps that Patridge is dating mellow Australian BMX rider Corey Bohan.
"It's so refreshing to be around him because he's so just laid-back and stress-free all the time," she says.
But you may get to see that chemistry for yourself on her own new reality show, which begins filming at the end of the year.
"My boyfriend may be in it. We don't start filming until the end of this year and next year, but it's just about my life and just every aspect," she says. "My family will be in it, my close friends, going to auditions, and the Hollywood life. It's not as glamorous as it looks."
Reporting by CHRISTINA YOON