Siobhán Emma Donaghy (born 14 June 1984) is an English singer-songwriter of Irish descent. She was a founding member of girl group the Sugababes, although she was replaced by Heidi Range in August 2001. Since her departure from the group, Donaghy has released five solo singles, two albums, and has appeared in a remixed version of the hit stage show Rent Remixed for its 2007–2008 run where she played Mimi alongside Denise Van Outen.