It takes considerable skill - to say nothing of nerve - to steal a show from the likes of Brad Hauskins, Adam Michael Lewis, and Eddie Staver III. But in the Circa '21 Dinner Playhouse's Empty Nest, actress Ashley Catherine Schmitt arrives halfway through the production, introduces herself to her co-stars, tucks playwright Lawrence Roman's comedy into her leg warmers, and all but dashes off with it. The play itself is too featherweight (albeit agreeably so) for this to be considered grand larceny, but it's certainly grand; Schmitt is like the guest you don't remember inviting who winds up being the life of the party.