In the Red Band Trailer for Vacation, the new sequel to the National Lampoon's Vacation film, Christina Applegate plays the wife of Ed Helms' Rusty Griswwold.
In one scene the family finds a "Mud enriched spring" which actually turns out to be raw sewage dumping pond. Gross out joke aside, she covers herself in the mud (It is mud regardless of the implication that it's shit) So I took some screen grabs. Not going to link to the trailer (Kids) but you can find it on YT.
I know some people aren't going to like it based on the context of the joke in the film, but at face value it's Christina Applegate covered in mud. So there's that.