Troubled country star Mindy McCready has been released from jail in Tennessee, after serving three months of a year-long sentence for violating her probation. The 32-year-old was locked up in September (07) on charges of battery and resisting arrest, following an argument with her mother. A court ruled the charges violated her probation stemming from a 2004 prescription drug fraud charge. Speaking after her release on Sunday (30Dec07), MCCready said, "I'm so happy to be out. I'm the happiest girl in the world right now. "I'm going to work, work, work and sing, and I'm going to see my son (Zander, one) who I miss." As a condition of her early release, MCCready must spend the next two years on probation. The singer has a history of personal problems, including a physically abusive relationship with a former boyfriend and several suicide attempts.