Kristin Cavallari believes hydration is the key to maintaining a youthful appearance.
The Laguna Beach star has her own jewellery range, Uncommon James, and has just launched the brand Uncommon Beauty, featuring her five essential skincare products made with clean ingredients.
"Hydration, hydration, hydration," Kristin told Page Six Style when asked about her beauty mantra. "I really think hydration is the most important thing in skincare.
"Obviously drinking water, but everything we're putting on our face too. That's the best thing for anti-ageing."
The Uncommon Beauty range includes the Daily Water Cream, a lightweight moisturiser that she developed to prevent her acne-prone complexion from becoming clogged, and the Pineapple Peptide Nectar, her favourite product in the line which contains peptides and vitamin C to help brighten and hydrate the skin.
Kristin said keeping her undereye area moisturised is a crucial part of her daily skincare regime, so she included a Triple Effect Eye Cream in her range too.
"As we get older, eye cream is arguably the most important step in the beauty routine," the 34-year-old star explained.
Kristin also revealed she never goes anywhere without lip balm in her handbag and swears by her Mango Lip Balm to keep her pout feeling super soft.
"This goes everywhere with me," she said. "I have it in my purse, I have it in my travel bag."
Before bed each night, Kristin follows a daily skincare regime consisting of Neutrogena make-up remover wipes and foaming cleanser, followed by serum, moisturiser, eye cream, lip balm, and finally Herbivore's Emerald Deep Moisture Glow Oil for "a little additional lubrication".