She was named the first runner-up in the 2007 Miss Teen USA pageant while representing New Jersey and represented California in the 2011 Miss USA pageant. As the reigning Miss USA, she represented the United States in the Miss Universe 2011 pageant held in São Paulo, Brazil, in September 2011, where she finished in the top 15.
Miss Teen USA:In October 2006, Campanella was crowned Miss New Jersey Teen USA 2007 and represented her state at Miss Teen USA 2007, broadcast live from Pasadena, California on August 24, 2007, placing first runner up to eventual winner, Hilary Cruz of Colorado.
Campanella competed in the Miss New Jersey USA pageant twice, placing first runner-up in 2008 and in the top fifteen in 2009.
On November 21, 2010, she competed in the Miss California USA pageant and won the title. She was the first Miss Teen USA state delegate to represent California at Miss USA since Shauna Gambill in 1998. She was heavily favored by Vegas oddsmakers to win the title of Miss USA.
On June 19, 2011, she won the Miss USA title in Las Vegas, Nevada. As Miss USA 2011, she will go on to compete in Miss Universe 2011 on September 12, 2011 in Brazil.