No it's not. It doesn't have a navigation system. For the exterior it has a spoiler, and polished 17 inch rims which almost looks like chrome. It doesn't have premium floormats either. Here's the list of the luxury package.

http://www.cadillac.com/cadillacjsp/model/po_package.jsp?model=sts&year=2007&package=- V6%20Luxury&showAllStdOpt=all§ion=Interior