What are friends for? As Natalie in American Pie Presents: The Naked Mile, Melanie plays one of the best friends of Erik Stifler's virgin girlfriend Tracy. Much to Stifler's chagrin, Melanie urges Tracy to resist Eric's persistence and hang on to her virginity. But Tracy's decision to handle things her own way is sure to upset her friends. That's one catfight we would love to watch.