Sia
Version 1 - the official version
Version 2 - they accidentally uppted this one to their YT account and then later took it down in favor of version one. Sarah has the whole second verse and it features way more Nadine, whereas Version 1 they split the second verse Sarah/Kimba and relegates Nadine to only backing vocals

http://www11.zippyshare.com/v/73688097/file.html