Kristen Bell is celebrating her 12th wedding anniversary by sharing one of her husband Dax Shepard's more, uh, unusual promises. "Happy 12th wedding anniversary to the man who once said to me: 'I would never kill you. A lot of men have killed their wives at a certain point. Even though I'm heavily incentivized to kill you, I never would.' ❤️," Bell, 45, posted via Instagram on Friday, October 17, along with a photo of the pair embracing on the edge of a bed.