Vanessa Hudgens
Vanessa Hudgens is an American actress best known for her work in "High School Musical" and for taking nude pictures of herself. She is incredibly popular among both nine-year-old girls and autistic manchildren alike. Joshua Martinez used her identity to troll Chris.
Chris, being the humble human being that he is, found it absolutely reasonable that a highly attractive and popular movie star was sexually interested in him.
Since Vanessa told Chris she wrote her own Wikipedia biography, Chris has a righteous claim to do so too.
In KCWC Top 10 Dedication Special, he admits that he finally realized that he really was not talking to Vanessa Hudgens. He also admits that "Vanessa" always used Joshua's screenname when talking to him, proving that either Chris is the biggest idiot of all time, or Joshua is the laziest troll of all time. Take your pick.