Sadie, who has competed on 'Dancing with the Stars,' recently broke up with her longtime boyfriend and rumors had been flying around that she was now dating Texas A&M quarterback Trevor Knight. Though most of the attention is on the bearded patriarchs of the family, one of the stars of the show is Sadie Robertson, the 19-year-old daughter of Willie Robertson. A&E's 'Duck Dynasty' is one of the top shows on cable television as it follows the Robertson clan out of Monroe, Louisiana, known for owning and running the 'Duck Commander' line of products.