If you thought Kristen Wiig and Melissa McCarthy were tight friends, then you ain't seen nothing yet. After cracking each other up [1] with their old job stories, the funny ladies joined their Ghostbusters [2] costars for a hilarious game of Heads Up! on The Ellen DeGeneres Show. Not only did they show off their cool dance moves, but the real fun came when they had to bump and grind. Let's just say, Kristen goes all out. LOL!