BK and Tyler from Florida Georgia Line have the the biggest song ever!  "Cruise" is now the top selling digital country single of all time. 

This isn't the first record "Cruise" has broken as it became the longest number one on the Billboard Hot Country Songs Chart in its 69-year history last year.

It's been downloaded 6.33 million times, passing Lady Antebellum's "Need You Now", which is at 6.27 million. 

Taylor Swift's "Love Story" is third with 5.66 million downloads.