Credit: Courtesy Art Partners

Movie star, mother, and now Lancome cosmetics spokeswoman, Julia Roberts continues to evolve and amaze, looking more luminous than ever at 42. "The whole idea of modeling in my 40s is fun and modern," Roberts told us. "I'm more secure in who I am today. Also, Lancome is a company whose products I have used and enjoyed for a long time." We went behind the scenes of her Lancome campaign shoot to snag tips from the ultimate, ahem, pretty woman.Hint: She loves eyeliner a la Sophia Loren. Click on the gallery to see how Julia got the look (with the help of her makeup artist, Genevieve Herr).