Stern appeared on Late Show with David Letterman wearing a T-shirt with a glamorous picture of Moonves and his wife, Big Brother host Julie Chen, on the front, and announced, "I'm on the 'I Hate Les Moonves Tour.'"
The radio host is being sued for $500 million, for allegedly breaching his contract with broadcasting giant CBS.
Moonves insists Stern failed to disclose the details of his new deal with Sirius Satellite Radio, while still working for Infinity.
"You've worked for jerks and bullies who hide behind their press agents. Les Moonves is a bully.
Referring to Moonves' past acting jobs, Stern quipped, "CBS took a C-list actor from the Love Boat and made him CEO."
Stern's appearance on the show, which aired on CBS, was scheduled before the lawsuit was filed against him.
CBS has issued as statement regarding Stern's appearance saying, "We believe his appearance was his desperate attempt to distract attention from the facts of the case."
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