Rosie Huntington-Whiteley is a lot nicer than people give her credit for.

The 24-year-old supermodel, who famously replaced Megan Fox in the upcoming Transformers: Dark of the Moon, tells the July/August issue of Women's Health that there's no rivalry between her and Fox, 25.

"People always tell me, 'Gosh, you're so nice!'" she says. "Like they expect me to be a huge bitch!"

And yet, dealing with comparisons to Fox were the least of her worries. "Shia [LaBeouf] made it clear this wasn't just about becoming a movie star," Huntington-Whiteley says. "The shooting schedule was going to be grueling."

LaBeouf wasn't kidding. "You're in the sun all day long," the actress says, noting that it was "dirty and smelly" on set. "It was like boot camp."

The British beauty -- dating action star Jason Statham, 43, since last April -- also opens up about her love of organic food.

"[I'm always] thinking about the things that go into processed foods -- chemicals, additives," she says. "Sometimes you go into a supermarket and the apples are all the same size and color, but that's not what apples are supposed to look like. Go to an orchard or an organic farm, and the apples are sometimes knobby, but they taste better."