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The Look Who's Talking and Cheers actress passed away on Monday at the age of 71 following a short battle with cancer. After her children announced the news, Travolta wrote a short tribute to his frequent co-star and fellow Scientologist on Instagram. "Kirstie was one of the most special relationships I've ever had," he wrote alongside a photo of Alley and an image of them together. "I love you Kirstie. I know we will see each other again.". Travolta starred alongside Alley in 1989's Look Who's Talking and the sequels Look Who's Talking Too and Look Who's Talking Now.