Dave Grohls baby mama Jennifer Young is a horror movie producer who once worked as PA to Justin Theroux

Dave Grohl’s baby mama may have upended the Foo Fighters frontman’s longstanding marriage — but she’s more than just a rock and roll groupie.Jennifer Young — who confirmed to The Post that she is the mother of the former Nirvana drummer’s fourth child — has a master’s degree from the producer’s program at UCLA, worked as an on-set assistant to actor Justin Theroux, and has worked on horror flicks with the likes of industry icons Sam Raimi and Jason Blum, according to sources and interviews Young has given.She’s even co-wrote a graphic novel, “Cannibal,” described as an “anti apocalypse” story involving a “cannibal virus,” Young said in a interview.Young, 38, gave birth to a girl Aug.1, and Grohl, 56, vowed to be a “loving and supportive” parent to his fourth child.Young, who is from Florida but now lives in LA, was born to a 15-year-old mother who fostered her love of horror movies, she told VoyageLA in 2021.“I was watching Poltergeist, Pet Sematary and Candyman.

I saw Pulp Fiction when I was eight years old from the front row of the movie theater,” she said.She originally wanted to be an actress and said she bought a one-way ticket to New York and began auditioning, she told the outlet.“What I ended up learning was that my passion for film was a passion for storytelling and I could do that in front of or behind the camera,” she told VoyageLA.“I wrote a comic book that was published with Image Comics and turned it into a pilot that is currently in development.”Young was a hard worker with several producing credits but had been unable to land her big break in the film and TV industry, said a source who was close to Young a few years ago.“She’s got a magnetic personality,” the source told The Post.

“She’s funny.I’m a bit introverted – she’s extroverted.

She’s not afraid to talk to people.”The affair with Grohl was a shock, the source said.“(I’m) disappointed more than anything – she was ne...