Mutya Keisha Siobhan (MKS) is an English girl group. It formed in London in 2011. Its members are Siobhán Donaghy, Mutya Buena and Keisha Buchanan. They were the original members of Sugababes, but Siobhán left in 2001, Mutya left in 2005, and Keisha left in 2009. In 2013, they released their first single "Flatline". It was unsuccessful in the UK but reached 14 in the Irish chart. Their first album will be released by Polydor in 2014. They started a UK tour in November 2013.