Heidi Klum thinks about beau during lingerie shoots

Supermodel Heidi Klum says she looks into the lens and thinks about her boyfriend while she is on the sets.

"I don't really have a ritual before I shoot. I like looking fit all the time - not just for a shoot - as you never know when your clothes come off! When I first started modelling 20 years ago, I had to make some overall lifestyle changes...

"It's been a big part of my job to make sure that I'm fit on a regular basis. For me, that means drinking a lot of water, eating super healthy and making sure I sleep eight hours a day. That doesn't always work with my schedule, but I try! I also try to hit the treadmill two-three times a week," Klum told peoplestylewatch.com.

The 42-year-old does have a few modelling tricks up her sleeve, and one of them hits really close to home.

"I remember when I first started shooting swimwear and lingerie, and the advice photographers always gave me was to not over-pose," she revealed.

"No overarching, duck faces or strange poses so it doesn't look like you are trying too hard. Even though (photographer) Francesco Carrozzini is behind the camera, I look into the lens and I think about my boyfriend," added the model, whose been dating Vito Schnabel, 27, for over a year.