Entertainment Halo Fri ,01 2424 10 months ago Last Updated : 11:30 PM Kaia Gerber Swears by This Serum & Says the Main Ingredient Saved Her Skin Kaia Gerber's favorite serum is a must-have to clear acne and smooth fine lines. HALO NEWSLETTER Keep reading HALO with a Free Subscription unlock this story instantly and join members and pros reading HALO daily -It's Free SIGN UP LOGIN