Buchanan blasts ex-Sugababe Buena

British pop singer Keisha Buchanan has blasted her former Sugababes bandmate Mutya Buena for lying to fans about her reasons for leaving the band.

Buena, 20, quit the Round Round trio in December, claiming she wanted to spend more time with her baby daughter Tahlia, and was replaced by Amelle Berrabah, 21.