It may come as somewhat of a surprise that Gotye's smash hit "Somebody That I Used To Know" hadn't topped Billboard charts in the U.S., until now. After all, many folks stateside aren't aware of just how old the song really is. But after the consistent play, not to mention an exuberant amount of coinciding remixes, the infectious offering has officially topped the charts in the United States. Congrats to Gotye and his crew.