My Super Ex-Girlfriend (2006)

Everyone's had a painful parting of the ways with a romantic partner. We pick up the pieces and move on. But for one New York guy, it's not going to be so easy. When he breaks up with his girlfriend, he discovers his ex is actually the reluctant superhero, G-Girl. A scorned woman, she unleashes her super powers to humiliate and torment him.

Official website: http://www.mysuperex.com/