Keisha Kerreece Fayeanne Buchanan (born 30 September 1984) is an English singer-songwriter and was a founding member of the BRIT Award-winning girl group the Sugababes. With the Sugababes, Buchanan had six number one singles and two number one studio albums, making the Sugababes one of the most successful British pop acts of the 21st century. Buchanan was asked to leave the band in September 2009 and was replaced by Jade Ewen.

Buchanan met Mutya Buena while at primary school in Kingsbury. At the age of thirteen the pair met Siobh�n Donaghy at a music studio. The three formed a girl group called the Sugababies but then changed to the Sugababes. In 1998, the Sugababes were offered their first record deal with London Records and had their first break-through hit in 2000 with "Overload" from their debut album One Touch. After Donaghy left the group in August 2001 to be replaced by Heidi Range the group were dropped from London but were signed up by Island Records. Buena departed in December 2005, replaced by Amelle Berrabah, leaving Buchanan as the only founding member still in the Sugababes between 2005 to 2009. The Sugababes had six number-one singles, "Freak Like Me", "Round Round", "Hole in the Head", "Push the Button", "Walk This Way" and "About You Now". They have also had several top-three hits including "Ugly", "Girls" and Buchanan's final release with the group, "Get Sexy". The group has also had six top-ten albums, two of which, Taller in More Ways and Change, went to number one in the UK and were certified triple platinum. In terms of record sales, the Sugababes are the most successful female act of the century, and have had #1 singles in fifteen other countries in Europe and Asia � "Hole in the Head" also went to #1 on the U.S. Billboard dance chart.