Bell sparked rumours suggesting she and Shepard had tied the knot after posting a photo and suggestive caption on her Twitter.com. page on Wednesday (23Mar11).
In the post she wrote, "My adorable husband, @daxshepard1 voting 4 his favorite american idol. Over and over again."
But a rep for Bell has played down the wedding stories, insisting the actress often refers to Shepard as her husband.
Shepard proposed to the actress at the end of 2009, after two years of dating.