SISTAR has topped the brand new Billboard K-Pop Hot 100. We first mentioned Billboard Korea and the potential for a new chart back in 2009 and now the chart has finally launched. On the inaugural chart, SISTAR's "So cool" beat out popular 2NE1's "Ugly" and miss A's "Good Bye Baby." Debuting last year with "Push Push," "Shady Girl," and "How Dare You", the ladies of SISTAR have established themselves as one of the top artists in Korea. Here's what Billboard wrote about their new chart:

The Billboard K-Pop Hot 100 chart, launched in conjunction with Billboard Korea, is based on digital sales via leading websites as well as downloads from mobile service sites using an industry-standard formula and the most credible music data sources within Korea. The K-Pop Hot 100 debuts simultaneously here on Billboard.com, in the international chart section of Billboard.biz, in Billboard magazine, and also on Billboard Korea's website, billboard.co.kr. "The launch of the Billboard K-Pop Hot 100 chart is a milestone event, as it will provide the Korean music market with what we believe is Korea's most accurate and relevant song ranking," says Silvio Pietroluongo, Billboard's Director of Charts. "We're excited to be expanding Billboard's globally recognized Hot 100 chart franchise into this country, and look forward to enhancing the K-Pop Hot 100 chart in the near future with additional data as well as creating new charts that showcase the breadth of Korean music."