Nelly Says Rams Are ‘On Loaner’ In L.A., Still STL’s Team!

Nelly doesn't hate the Rams for leaving St. Louis -- he's still rooting for 'em ... assuring TMZ Sports they're just "on loan" to L.A. for the time being.  Yeah, don't hold your breath ...  The Rams are killin' it right now -- they're 3-0…