Party In The USA
5.38+ million copies sold worldwide
#4 - 3.377.000 points (Mediatraffic)
#1: US (Digital), US (Pop)
Top 10: Australia, Canada, France, Hungary, Ireland, Japan, New Zealand, USA,
Top 20:: Belgium (Wallonia), Norway, United Kingdom
Top 40: Austria, Belgium (Flanders), Czech Republic, Denmark, Slovakia, Spain, Sweden
I'm not really sure what defines a "global hit" but I guess this is the closest Miley might have.