Howling:Where's that clip of River Song from?

I've been enjoying the Series 6 dvd set, but something odd cropped up. At the end of A Christmas Carol, the "clip preview" of the season was included. One of the clips was of River Song winking, either nude or wearing a very decollete dress. I don't recall that showing up in the season. Anyone know where it's from?Boblipton talk to me 02:13, November 28, 2011 (UTC)