It looks like Nicole Richie isn’t the only fan of a good top knot—her four-year-old daughter Harlow is, too! The mother-daughter duo showed off their matching ‘dos when out and about in Los Angeles, proving the celebrity-loved failproof style is good for any age (even toddlers). And Richie has a secret for getting her hair so smooth—Suave Professionals Keratin Infusion Smooth & Shine Serum. “I have curly hair, and this is a great way to get the frizz out,” she revealed in InStyle’s August issue. “It makes hair smooth and manageable.” Snatch it up for just $3 at a drugstore near you. Plus, check out more top knots styles in the gallery!