Worst Performances: Sphere (1998), Catwoman (2004), Alpha Dog (2006), Basic Instinct 2 (2006)

If only Sharon Stone could work exclusively with Martin Scorsese. In the acclaimed director's 1995 masterwork Casino, Stone gave a thunderous performance worthy of the Academy Award nomination she received. Ever since then, though, she's been the queen of overacting, ineffectively hamming it up as the villain in 2004's regrettable Catwoman and overselling her worst-mom-ever character in 2006's Alpha Dog.