There is always a little extra fascination when on-screen chemistry turns out not to be acting at all. Hollywood has a long history of fictional romances spilling into real life, with co-stars taking the spark audiences loved and carrying it far beyond the set. Some of these relationships became long marriages, others burned bright for a while, but all of them gave fans that rare feeling that the movie or show was not entirely make-believe. That is exactly why these fictional couples who became real-life couples are still so fun to talk about.