...that stands for "little denim dress," of course...
The denim minidress is by Roommates, bought at Forman Mills in January 2012; the boots are Jaclyn Smith "Tiana" black suede boots, from Kmart in October 2013. Other accessories are a polka-dot bow, gold jewelry, and natural hose.
I think the caption for the second portrait is "Oh, dear, was that the doorbell?"
Two outfits still to post; and you have until tomorrow to respond to the survey at the right (details here)!