Jessica Simpson may have just debuted a fresh blonde ‘do, but she’s done with being called a dumb blonde—especially by a bitter ex!

An insider told OKMagazine.com exclusively the 34-year-old feels “humiliated” after Dane Cook made a remark about her being “dumb” on Watch What Happens Live.

“Jess has a pretty thick skin, but one thing that sets her off is when people insult her intelligence,” the source told OK! “She thinks Dane is so tacky and although she isn’t surprised he’d stoop to something so cheap and degrading, it still makes her mad.”

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Cook and Simpson had a “steamy affair” while filming the 2006 movie Employee of the Month, right after her split from Nick Lachey.

Even though their hookup is ancient history—and Jess is happily married with children to Eric Johnson—Dane is still bitter about being dumped by the blonde bombshell, our insider said.

“Jessica says it’s sad that Dane is obviously still sore about her all these years later,” the source said. “He was without doubt the most egotistical, controlling guy she’s ever dated and that says a lot for someone who spent so long with John Mayer.”

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And Jessica isn’t the only one who’s mad about Dane’s comments! Her husband isn’t all too pleased with Cook, according to the source.

“[Her husband] Eric will punch Dane’s lights out if he ever lays eyes on him.”

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