The reunion is complete as Shannon Elizabeth has signed on to reprise her role as Nadia in Universal Pictures’ “American Reunion,” the latest edition in the “American Pie” franchise.She returns to a cast that includes Jason Biggs, Seann William Scott, Alyson Hannigan, Thomas Ian Nicholas, Chris Klein, Eugene Levy, Tara Reid, Eddie Kaye Thomas, Jennifer Coolidge and Mena Suvari. Variety first reported that Katrina Bowden is the newest member to the join the cast playing Klein’s girlfriend. Jon Hurwitz and Hayden Schlossberg are writing and directing with Craig Perry, Chris Moore and Warren Zide producing. Elizabeth was the last of the returning cast members to sign on to the pic, currently in production. She’s repped by Buchwald/Fortitude.