Pete spilled the beans on an episode of US talk show Watch What Happens Live, where he sang his praises for Jess as well as ex-wife Ashlee, and their father, Joe Simpson.
On Jess, Pete points out it's no accident she's a massively successful businesswoman.
"She’s got a multi-billion-dollar company. I think she’s a secret genius," he said, referring to her clothing line, TV show Fashion Star, her Weight Watchers deal and many other endorsements.
Pete also described Ashlee as a "great mother" to their son Bronx, and Joe Simpson, despite his recent bad press, as a "great grandfather and a really good guy".
Rock star Pete shares custody of Bronx with Ashlee, so he remains close to the Simpson house.
Whether Jess is a genius or not is still up in the air, but with the kind of money her billion-dollar empire makes, she can certainly afford a university degree or two.
Check out some of our favourite Jessica Simpson-related moments below.
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