2006 malibu LTZ front boot issue

[94 saturn sl1 2000 saturn sc2]

I have a front driver side strut that the dust boot is turning when i turn the wheel and making some chatter. As far as i can tell there is no ride issues other than a vibration in the seat at 60mph until about 75mph. Does just the boot need to be changed or the whole thing? Is an allignment neccesary after replacement? Thanks folks.