LOS ANGELES (Reuters) – Actress Kirstie Alley described on Wednesday how she fell in love more than 20 years ago with John Travolta, and rejected widespread Hollywood speculation that the "Grease" star is secretly gay. Alley, former star of the 1980s TV comedy "Cheers," told ABC television journalist Barbara Walters that she fell for both Travolta and actor Patrick Swayze in the 1980s, although their romances never got physical. Alley, 61, said she was attracted to Travolta while the pair were making the 1989 movie "Look Who's Talking," calling him "the greatest love of my life. …