Mario Lopez, best known for his role years ago as ego-driven teen A.C. Slater on "Saved by the Bell," has enjoyed a second career as a successful, seemingly ubiquitous, TV host. Lopez was the runner-up to former NFL star Emmitt Smith in the third season of "Dancing with the Stars." Since then, he's hosted the entertainment news program "Extra" and the singing competition reality show "The X Factor" on FOX. More...