Chris Klein is such a huge fan of American Pie; he is back for some more. The actor will reprise his role as Chris “Oz” Ostreicher in the upcoming film American Reunion. Klein, who completed a 30-day alcohol addiction program last summer, joins fellow American Pie alums Jason Biggs, Seann William Scott, Eugene Levy and Alyson Hannigan. Filming of the new installment in the franchise begins May 24.