Art may be imitating life on the set of "Mad Men." According to Star magazine, January Jones has an issue with Jessica Pare. "January is furious because she pretty much had no story line this season, not to mention that she had to wear a fat suit!” a source told Star. “Meanwhile, Jessica is an overnight sensation. … January is so completely jealous that she has been treating Jessica like complete crap.” If this is indeed true (and I have no trouble imagining it could be), it explains why they only had one scene together this season. No wonder it was so uncomfortable to watch -- it was real. Well … maybe. [Celebitchy]
These two are hardly the first co-stars in history who couldn't stand working together. Egos have been around forever. Click on to see more celebs who (allegedly) had major beef on set.