For the record I know nothing of Justin Bieber beyond the fact that he sings pop music. But when I found this picture on a website featuring photos from the new season of CSI I died laughing.
Ahahaha I know it's just an unfortunate photo, but it totally looks like Nick is checking out Justin Bieber's ass. XD
The rest of the (rather boring) photos can be found here: http://www.daemonstv.com/2010/08/24/csi-season-11-premiere-photos-with-justin-bieber/