Dave Grohl's Wife Jordyn Was 'Shocked' When She Found Out About Secret Baby: Inside Their Marriage (Exclusive Sources)

"Her friends are like family, and they rallied around her," a source tells PEOPLE about Blum

<p>Michael Kovac/Getty</p> Jordyn Blum and Dave Grohl attend 2018 LACMA Art + Film Gala honoring Catherine Opie and Guillermo del Toro presented by Gucci at LACMA on Nov. 3, 2018 in Los Angeles

Michael Kovac/Getty

Jordyn Blum and Dave Grohl attend 2018 LACMA Art + Film Gala honoring Catherine Opie and Guillermo del Toro presented by Gucci at LACMA on Nov. 3, 2018 in Los Angeles

Dave Grohl and Jordyn Blum's future together remains unclear following news the rocker recently welcomed a child with another woman.

On Tuesday, Sept. 10, the Foo Fighters frontman, 55, made the shocking revelation on Instagram, telling fans he is doing "everything I can to regain" the trust of Blum and their children. (Grohl and Blum are parents to daughters Violet, 18, Harper, 15, and Ophelia, 10.)

According to a source close to Blum, the interior designer, 48, has known "for a while" about Grohl's baby news.

"She was shocked when she found out about the baby. Her friends are like family, and they rallied around her," says another Blum friend.

Over the years, "Dave's flirty behavior has been a hurdle in their marriage. It's been hurtful to Jordyn," adds the Blum source.

Related: Dave Grohl Admits He Has a New Baby Outside of His 21-Year Marriage: 'Doing Everything I Can to Regain Trust'

While Grohl's fans were shocked by his baby news, some in the couple's circle weren't entirely surprised.

“We keep reading over and over again how heartbroken everyone is because Dave was supposed to be the ‘good guy,' the rockstar that didn’t have to do those rockstar things," says a source who knows the couple. "And people are crazy about the guy, but there is a rockstar side."

Grohl and Blum — who have been married since 2003 — also often "felt like an opposites attract type of [relationship]," adds the source.

A rep for Grohl declined to comment, and Blum has not responded to requests for comment from PEOPLE.

Jason Merritt/Getty Jordyn Blum and Dave Grohl at the 2011 MTV Movie Awards at Universal Studios' Gibson Amphitheatre on June 5, 2011 in Universal City, Calif.
Jason Merritt/Getty Jordyn Blum and Dave Grohl at the 2011 MTV Movie Awards at Universal Studios' Gibson Amphitheatre on June 5, 2011 in Universal City, Calif.

Related: Dave Grohl Retained a Divorce Lawyer Before Revealing He Welcomed a Child Outside of His Marriage: Source (Exclusive)

Through the recent upheaval in their marriage, both Grohl and Blum are prioritizing their kids. "I love my wife and my children, and I am doing everything I can to regain their trust and earn their forgiveness," Grohl wrote in his Sept. 10 post. "We're grateful for your consideration toward all the children involved, as we move forward together."

Says the Blum source: "She's a great mom and very dedicated to their daughters."

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Grohl and Blum — who marked their 21st wedding anniversary in August — attended Wimbledon in London in July, where they were photographed sitting side by side laughing and chatting with Duran Duran rocker Simon Le Bon.

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