Exclusive | Miranda Kerr’s 3 skincare rules to live by — and her clever trick for reapplying sunscreen

It seems like everyone’s got a 20-step skincare routine lately, but if you’re following the supermodel playbook, keeping your skin young, glowing and healthy is pretty simple.

Just ask Miranda Kerr, who shared her three most important skincare rules to live by with The Post — and none of them require a crazy budget or time commitment.

And if sunscreen reapplication is your weakness, the 42-year-old former Victoria’s Secret Angel has a trick for that.

Rule #1: Wear SPF daily.

All the heavy-duty serums and moisturizers in the world aren’t going to do much if you’re letting your skin bake in damaging UV rays without protection.

Kerr’s priority is organic sunscreen, particularly her own Kora Organics Silky Sun Drops 100% Mineral Sunscreen Serum, $57 — for which she says “every ingredient has been grown and harvested without synthetic pesticides, herbicides or GMOs, and that the formula is free from synthetic parabens, oxybenzone and other potentially harmful actives.”

“I wanted sun protection that not only shields you from UV rays, but also nourishes and supports your skin barrier with pure, plant powered actives, no compromises, no white cast, and no harsh chemicals,” she said

“UV exposure is the number one cause of premature aging, so make it non-negotiable,” she advised.

But putting it on in the morning and forgetting about it for the rest of the day doesn’t quite cut it either. Most experts recommend reapplying every two hours or just after sweating or being in the water — and yes, you can still be exposed to UV rays when you’re inside through windows.

Remembering to touch up can be tough, but Kerr’s got a method that ensures she doesn’t skimp.

“I also keep spares in my bag and by the kitchen sink, so no matter where I am, I see it and reach for it,” she said. “Over time, reapplication has become second nature rather than an afterthought.”

Rule #2: Hydrate — inside and out.

“Beyond sunscreen, I lean into extra hydration and gentle exfoliation to keep my skin balanced in the heat,” she said.

For that she applies her brand’s Milky Mushroom Ultra-Hydrating Mask, $55, overnight. and wakes up with “glowing, bouncy skin.” Her other favorites include the Active Algae Hydration Mist, $46, and Noni Glow Face Oil, $76, which she uses in the morning and evening after her shower.

“I also pay attention to what I’m eating and drinking: More fresh summer fruits like berries for their antioxidants, and of course my lemon water ritual and celery juice to stay alkalized,” she said.

“Hydrated skin looks plumper and more youthful.”

Those antioxidants in berries actually have a ton of benefits beyond your skin. Blueberries, raspberries, acai berries and goji berries, in particular, can improve cholesterol levels, reduce blood pressure and support heart health.

Rule #3: Focus on consistent, gentle renewal.

“Rather than harsh treatments, gently exfoliate a few times a week,” She said.

Her product recs include her brand’s Turmeric 2:1 Mask, $55, and “nourishing actives” like Plant Stem Cell Retinol Alternative Serum, $79.

“Slow, steady cell turnover keeps skin radiant and resilient,” she said.