The divorce of Kevin Costner and Christine Baumgartner, his wife of nearly two decades, has been finalized. California court records filed Tuesday say the two have been declared single by a Santa Barbara County judge. Baumgartner, a model and handbag designer, filed for divorce from the Oscar-winning movie and TV star nine months ago. The two appeared to be headed for an ugly trial after public fights over custody and support payments for their three teenage children. But they reached a settlement agreement in September that allowed them to avoid it. The two began dating in 1998 and married in 2004. It was the second marriage for Costner.