Heidi Klum bared all on the cover of Ocean Drive magazine. (Photo by Chris Pizzello/Invision/AP)

German supermodel Heidi Klum goes topless on the cover of Ocean Drive Magazine.

The 45-year-old supermodel bared all on the cover of Ocean Drive magazine to celebrate their 25th anniversary swimsuit issue, and Heidi has opened up about embracing her less-is-more mantra when it comes to sunning herself on the beach.

In an interview with the publication, she shared: "I tend to not wear a whole lot of swimsuit when I am sunbathing. So I usually go for a tie-string bikini, something that has less coverage, and if no one is around, I'll wear only the bottom.

Heidi has opened up about embracing her less-is-more mantra. (Pic: Instagram/hairbylorenzomartin)

"I grew up being very comfortable with my body and very free."

The German beauty - who was the first model from her country to become a Victoria's Secret Angel - also explained how her upbringing led to her carefree attitude and approach to nudity.

She revealed: "I grew up in a very free environment with my parents. We'd go to nude beaches. We're very open-minded, but you can't say that about all Germans.

"We didn't have a lot of money, so we'd go camping a lot and my parents chose nude campsites, so nudity became normal for me. I loved it."

Heidi has urged other women to follow suit and embrace their bodies, no matter their age.

She said: "I see it like this: we only have one life. This is our life right now and and our moment, and our moment shouldn't be over after a certain age.There's not a time frame for only being able to wear a certain thing or to be in love, to go out.

"Thirty years old is not the cap and then you have to hide yourself and not go dancing anymore."