A remarkable pop cover of Chris Brown's hit song 'Look At Me Now' is taking the online world by storm, due to an unexpected flow and swagger from its decidedly un-hip-hop performers.

The artists are Boston group Karmin, composed of Amy Heidemann and Nick Noonan, who perform original music and covers. Armed with only a keyboard, the duo produced the version of 'Look At Me Now' that has gone viral.

Amy nails Busta Rhymes' dizzying mid-song guest verse. She and Nick sing the chorus together, hilariously harmonizing about "getting paper."

The original 'Look At Me Now,' by Brown featuring Busta Rhymes and Lil Wayne, has reached No. 6 so far on the pop chart.

According to Karmin's Twitter, they got a personal call from producer Jermaine Dupri this week. How long it will be until Brown himself comments on the cover?

Watch Karmin Cover Chris Brown's 'Look At Me Now'