Siobhán Emma Donaghy (born 14 June 1984) is an English singer-songwriter. She is a founding member of the girl groups Sugababes and Mutya Keisha Siobhan. Donaghy left the Sugababes in 2001 following arguments with and accusations from Keisha Buchanan. Donaghy released her debut solo album, Revolution in Me, on 23 September 2003, which contained three single releases. Her second studio album, Ghosts, was released on 25 June 2007. Donaghy appeared in a remixed version of the hit stage show Rent (titled Rent Remixed) for its 2007–2008 run, playing the role of Mimi alongside Denise van Outen.