15Jennifer Morrison and Lana Parrilla allegedly feuded behind the scenes

Jennifer Morrison David Anders and Lana Parrila in Once Upon A Time

It's hardly ever a guarantee that co-stars are going to get along. Celebrity feuds aren't exactly a new concept, and in this day and age of social media and convention circuits, spats can get pretty out of hand pretty fast.

However, in the case of Jennifer Morrison and Lana Parrilla,

their mutual dislike has been more of an open secret within the show's fandom for years.

The Once cast is a remarkably close one, with many true lifelong friendships having been formed within the ranks. Morrison and Parrilla, however, are decidedly not part of that trend. Rarely ever taking a photo together or engaging in any joint events or interviews, the duo are also pitted against one another by the fans.

Some eagle-eyed viewers have even pointed out that certain scenes between the two clearly use body doubles, which really says it all when it comes to their inability to tolerate one another.

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