Back in 2010, the remarkably complete remains of a juvenile Chasmosaurus was found in Dinosaur Park in Alberta, and a paper has just come out describing it, complete with a new reconstruction made by the authors and Michael Skrepnick (the paleoartist who lent us his wonderful Diplodocus for our cover art!).
What makes the find exciting is the amount of detail we can now have about a ceratopsid while it grows. There's been a recent trend in dinosaur paleobiology to emphasize the amount of anatomical (and thus perhaps physiological, behavioral and ecological) changes that happen during the animal's life - and so getting a good look at dinosaurs during growth is imperative. Also, baby dinosaurs!
See here for the news item (and reconstruction!)
Here's the journal article