American shock jock Howard Stern blasted former employer, CBS/Infinity chairman Les Moonves, during an appearance on talk show host David Letterman's show, calling him a "jerk" and a "bully".
Stern appeared on Late Show With David Letterman wearing a T-shirt with a glamorous picture of Moonves and his wife, US 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 (GBP294 million), for allegedly breaching his contract with US broadcasting giant CBS.
Moonves insists Stern failed to disclose the details of his new deal with Sirius Satellite Radio, while still working for Infinity.
Stern told Letterman, "I believe you are working for one of the biggest jerks on the planet.
"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 airs 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."