Howling:River less than dressed in Next Time of Christmas Carol?

I've been watching my new Series 6 Box Set recently, and noticed that at the end of A Christmas Carol they have a Next Time style trailer with a few shots of the first half of Series Six. There is a shot that I didn't recognise from the actual series - a head-and-shoulders close-up of Alex Kingston as River Song, facing the camera/slightly tilted to our right, with bare shoulders and a smirk on her face which kind of hints that she's not wearing very much else. I've just watched the first half of the series (actually watched up to episode 8) and haven't seen her dressed like that, so I'm wondering if this is something they shot but didn't include? Or has anyone else spotted where it occurs? I assume from the timing of how Series Six was shown (Episodes 1-7 April to June, Episode 8-13 after August) that they wouldn't have had any of the second half shot by the time the Christmas 2010 episode aired, but I could be wrong. (Now that I look at the filming order in the Wiki, Night Terrors, which was shown in the second half, was filmed before The Impossible Astronaut - but River isn't in that...) the angel Jean - Smith's little elf☎ 11:53, November 24, 2012 (UTC)