Actress Kelly Preston has died following a two-year battle with breast cancer, husband John Travolta said in a social media post. She was 57. "It is with a very heavy heart that I inform you that my beautiful wife, Kelly, has lost her two-year battle with breast cancer," Travolta wrote Sunday in an Instagram post. "She fought a courageous fight with the love and support of so many." The actor praised doctors and nurses at MD Anderson Cancer Center in Houston as well as Preston's "many friends and loved ones who have been by her side." "Kelly's love and life...