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Macklemore and Ryan Lewis' hit single "Thrift Shop" has hit another milestone.  The pair's track has been certified four times platinum after selling more than four million copies.

Since the song debuted last October, it has spent 21 weeks on the Billboard Hot 100 chart. 

The rapper-producer duo burst onto the mainstream scene with the debut album The Heist.  The record sold more than 78-thousand copies in its first week, and debuted at number two on the Billboard 200 chart.  It has since sold more than 420-thousand records.