In the latest issue of Harper's Bazaar magazine, Diaz reveals that Drew Barrymore and Cameron Diaz met her future co-star and best friend when she was just 16.As a teenager modeling in Los Angeles, Diaz says her first encounter with child star Barrymore occurred at a store when the "E.T" star stepped in to help her.She said, "I first met Drew when she stuck up for me in a Beverly Hills magazine shop when this guy was being aggressive. I knew who she was. I wasn't really star-struck, but I felt like I knew her in a different way, as we all do when we watch people on television ."The pair are now inseparable friends, helping each other with their breakups to Justin Timberlake and Fabrizio Moretti. The former co-stars recently vacationed in Hawaii together.Barrymore revealed that she is still protective of her friend, saying, "I still feel very territorial with her."