EXCLUSIVE : Charlie Gillespie ( Julie and the Phantoms ), Sara Waisglass ( Ginny & Georgia ) and Siena Augudong ( Sidelined: The QB and Me ) have been set to star in YA romance The One Before The One , which Blue Fox Entertainment is launching at the Cannes market. Production is slated to begin July 6 in Austin, Texas, on the movie written and to be directed by Brittany Sarkisian, based on a story by John E Clark. The film is produced by Sarkisian and Jaylen Moore for Showmance Productions, along with Raja Collins, Dan Sheldon and Tara Pirnia.  The synopsis reads: “When burned-out Wall Street analyst Steven (Gillespie) returns to his hometown for his twentieth high school reunion, he is inexplicably transported back to his senior year and reunited with his lost love, Beth (Agudong). Steven becomes determined to rewrite history, but the version of Beth he spent twenty years idolizing may not be the soulmate he remembered.…