With FirstNude the 4 girls are named: Margareth, Nancy, Emma and Brigitta
http://first-nude.com/hosted/gallery.php?id=139b48&afid=1132443
http://first-nude.com/hosted/gallery.php?id=1091cb&afid=1132443
I've no idea who-is-who. FN doesn't specify. Don't recognize her from somewhere else.