Foo Fighters frontman Dave Grohl has welcomed a child “outside” of his marriage and is fighting to “regain” the trust of his wife, Jordyn Blum, and other children.

The rock legend made the stunning revelation in an Instagram post on Tuesday, September 10.

“I’ve recently become the father of a new baby daughter, born outside of my marriage,” Grohl wrote in a statement.

“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.”

A rep for Grohl told The Post that there was no additional comment from the musician at this time.

Grohl and his wife Blum married in 2003 and have three children together.

This is a developing story …