Movie site AICN has an early review of Kevin Smith's upcoming film, formerly known as A Couple of Dicks and then A Couple of Cops, starring Bruce Willis and Tracy Morgan. Rashida has a role in the movie, which apparently includes a scene where she's wearing lingerie.
A quick Google search didn't turn up anything else about her being in it, but there should be more as the release date draws near. The movie is scheduled for 26 February 2010.
Thanks to TJ for the link :)