Dave Grohl’s baby mama is a 38-year-old, Florida-born rock ‘n’ roll fan who now resides in Los Angeles with their child, she confirmed to The Post. Jennifer Young had a baby girl with the married Foo Fighters frontman, 56, on Aug. 1 of last year — and the tot has Grohl’s last name, according to records obtained by The Post. Young confirmed that the former Nirvana drummer — who vowed to be a “loving and supportive” parent to his fourth child when he revealed the affair last fall — is the father of her child. But she told The Post “I can’t comment” when asked whether Grohl was in the kid’s life, as promised. Young is raising the child in a modest house with her own mother in a leafy neighborhood of Los Angeles. It’s unclear how much contact Grohl has with Young, who sports tattoos of Paul McCartney lyrics and the Metallica logo. She has been spotted pushing the baby in a stroller around Los Angeles — and the nearly 7-month-old girl has even sported a helmet with stickers of Elvis, Led Zeppelin, and Keanu Reeves. Young — whose bottle-blonde locks resemble those of Grohl’s wife of 21 years, Jordyn Blum — was recently in New York City on Valentine’s Day, at the same time the rocker was in town for Saturday Night Live’s 50th anniversary show. Young has not been publicly seen with the “Everlong” crooner. The identity of the woman who had a baby with one of the most famous rock stars in the world has remained a mystery ever since he revealed he cheated on Blum in an Instagram post last September. “I’ve recently become the father of a new baby daughter, born outside of my marriage,” he wrote at the time. “I plan to be a loving and supportive parent to her. I love my wife and my children, and I am doing everything I can to regain their trust and earn their forgiveness.” He added, “We’re grateful for your consideration toward all the children involved, as we move forward together.” It also appears that Young’s entire identity had been scrubbed from the internet with little trace of her professional life or social media. Concerned that Grohl’s fans will lash out at her and her baby, Young requested that The Post not name the child. “Protecting her identity is really important,” Young said, “because there’s some really angry fans.” Reps for Grohl didn’t return a request for comment Friday. The revelation of Grohl’s affair sent shockwaves through the industry — destroying his long-standing “good guy” reputation and devastating his family. Sources told The Post he and his wife Blum, 48, have struggled to rebuild their relationship. She stopped wearing her wedding ring, and friends said that she “didn’t trust” her husband. The couple was spotted together in Los Angeles on Feb. 11 — just days before the singer and Young were in the Big Apple at the same time. It was the first time they were seen together since the baby news broke. Grohl and Blum pair share three daughters: Violet, 18, Harper, 15, and Ophelia, 10. After Grohl’s bombshell confession, daughter Violet deactivated her social media before returning to the platforms a month later. Grohl’s first marriage was in 1994 to Jennifer Youngblood, a photographer. The pair split in 1997, and Grohl admitted he had cheated on her. For those who knew the rocker’s new baby mama, the revelation of Grohl’s baby comes as a surprise. “She was that girl in high school who was quiet, very pleasant, but not one of those who stood out,” said former classmate Chris Succi, who attended high school with her in 2005. “I feel like she was more into Gwen Stefani than Foo Fighters.” “I can think of like 20 other girls who were more likely to have Dave Grohl’s baby.” Additional reporting by Jared Downing and Reuven Fenton