Singer Mutya Buena has hit out at her former Sugababes bandmates for failing to support her solo career. The 21-year-old claims neither Heidi Range or Keisha Buchanan have contacted her about the forthcoming release of her debut album - which features a collaboration with pop superstar George Michael. Buena says, "I'm closer to George Michael than I am to them now. "I'm really upset none of the girls called me to wish me good luck. "We grew up together and have been through a lot."