Christine Sierra O’Brien and Joshua James Martin, both of Auburn, announce their plans to marry. Christine graduated from Del Oro High School in 1999 and graduated from National University in 2009 with a degree in public administration. She is currently employed by Placer County. Her parents are Bart and Loretta O’Brien of Colfax. Joshua graduated from Colfax High School in 1999. He owns and operates his business, Charis Landscape & Design, in Meadow Vista. His parents are Keith and Linda Martin of Applegate. Joshua proposed to Christine in November 2009 on the beach in Mexico. The couple plans to have an intimate wedding on January 1, 2011 in Makena, Maui.