John Travolta has penned an emotional tribute to his wife Kelly Preston after the actress died from cancer.A representative for the actor and his family confirmed that Kelly, 57, had died following a secret two-year battle with breast cancer.Taking to Instagram, the Pulp Fiction actor, who married Kelly in 1991, posted a snap of his late wife, and expressed his gratitude for the staff who have been by his wife's side, admitting that he is going to take some time out with his children to "heal".Writing to his 2.2million followers, he put: "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.
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