New mom Nicole Richie's upcoming appearance on U.S. TV sitcom Chuck will feature the socialite in a steamy shower smackdown with sexy Aussie actress Yvonne Strahovski.

Richie will play the bully who tormented Strahovski's character in high school; the pair meet again at a reunion.

And Chuck creator Josh Schwartz reveals, "While there, things go awry, and the old high school shower becomes the location of a seriously wet showdown with fisticuffs where they're attacking each other with pipes and plumbing."