Kim Cattrall and Sarah Jessica Parker
Though the two played besties Samantha and Carrie in the now-classic TV series Sex and the City, in real life, you won't catch these two hanging out anytime soon. Rumors swirled about a third SATC movie, but Cattrall quickly squashed them, and had some harsh words for her former co-star. She gave an interview to Piers Morgan, commenting, "This is really where I take to task the people from Sex and the City and, specifically, Sarah Jessica Parker in that I think she could have been nicer.... I don’t know what her issue is, I never have." Ouch.