Apart from having an impressive modeling portfolio, Rosie Huntington-Whiteley has become a beauty icon in her own right. Her lips are always full to perfection, and now we’ve learned her secret to keeping them flawless. The mastermind behind Rosie’s pout is Dr. Barbara Sturm, who tells E! that applying face serum to your lips every night is the key. Face serums are filled with essential nutrients and complexes that help promote younger, smoother skin. Rosie is a fan of Dr. Sturm’s serum from her own skincare line, but we’ve added some other options that can work as well.