Straight from Mahoney's RE Congress it's the New Wine liturgical dance corps!... No, wait. These are real ballet dancers. In a real ballet. On a real stage. (More RE Congress pictures on the PhatMass site, if you dare)
BTW, I should probably say something about the ballet itself before I leave for the night - it was AMAZING. There is so much there, I can't seem to find a good summary of it online anywhere, which is unfortunate, but the basic theme is that there is a man who is overcome by sin, making a pact with the devil. Progressively, he gets involved in a relationship with a girl, who subsequently dies and through her and divine assistance the man is able to throw off the chain of the devil. It is very much a story of sin and redemption, though not explicitly Christian. I highly recommend that if you have an opportunity to go see this ballet. The one we saw was done by Goethe, I'm not sure if it makes a difference (I'm, as I said, a complete neophyte to the ballet/opera world). I'd go to it again!