Shelley Catherine Hennig was born in January 2, 1987 in Destrehan, Louisiana. She won the Miss Louisiana Teen USA 2004 in a state pageant held in Lafayette, Louisiana, in November 2003. This was the first time that she competed in the state pageant. In August, she represented Louisiana in the Miss Teen USA 2004 pageant held in Palm Springs, California. She won the Miss Teen USA title, becoming the first winner from Louisiana and the first girl from Louisiana to win a national title.
On April 20, 2007, Shelley joined the cast of Days of our Lives in the contract role of Stephanie Johnson, a role previously held by Shayna Rose from July 2006 to January 2007. In 2010 she received a nomination for the 37th Daytime Emmy Awards in the Outstanding Younger Actress In A Drama Series category. On January 18, 2011, Hennig announced that she will be leaving Days of Our Lives. Shelley’s last tape date was February 2 and her character last aired on April 6, 2011.
From 2011 to 2012, she played the major character Diana Meade in the TV series The Secret Circle based on the books written by L.J Smith. On May 11, 2012, it was announced that the series would not be returning for a second season.
Hennig appeared in the MTV series Zach Stone Is Gonna Be Famous as Christy. On June 26, 2013, it was announced that the show was cancelled after one season.
She now appears in the second half of the third season of the MTV series Teen Wolf as the recurring character of Malia Tate, a were-coyote. And will be promoted to a series regular in Season 4, where creator, Jeff Davis, mentioned in an interview that Malia will have a trio friendship with Lydia and Kira and will develop a relationship with Stiles.