Daily roundup of entertainment and celebrity news.
Nicole Kidman 'Grace of Monaco' preview: Nicole Kidman as Grace Kelly. (hollywodoreporter.com)
Kristen Wiig to visit 'The Simpsons.' (ew.com)
Chris Brown launches new app. (eonline.com)
David Letterman makes surprise appearance at CBS upfront. (deadline.com)
Has 'Mission: Impossible 5' found its writer?' (aintitcool.com)