Ladies...Help Me Find This Clothing Item Please!

Ok, about 2 weeks ago I was watching TRL (MTV) and Christina Applegate, Cameron Diaz (can't stand) and Selma Blair were on promoting the new movie they have. Anywho, Christina was wearing something that I hadn't seen in a long time and it reminded me how cute it was.

Does anyone have or know of where I can find those dresses (are they considered shirts or like a wrap?) that you were over jeans? I know it isn't an actual dress. Thanks!