Hailey Baldwin Reveals the Hands-Down Sexiest Thing Justin Bieber Does

While that newly engaged glow is definitely the cousin-twice-removed of pregnancy glow, you can't give Bieber all the credit for Baldwin's lit-from-within skin — she does a lot of work to keep it that way. "I'm crazy about skin care," she said. "When I'm traveling, I'm always moisturizing, drinking lots of water. I use all of [dermatologist] Barbara Sturm's products. Her masks, her Face Cream ($215), her glow serum — they are amazing, and she also the nicest human being."

Her favorite in the lineup? Dr. Sturm's MC1 Blood Moisturizer, which goes for around $1,400 a pop and requires an in-person appointment so she can draw your blood, extract the plasma, and infuse it in the cream. "I love that weird blood cream." Baldwin laughed. "It is fascinating to me, and it works. I'm a nerd about the science of skin care and health, so for me, I'm like, 'This is so cool!'"