Who's Dave Grohl's baby mama?

Dave Grohl shocked fans when he revealed he had fathered a baby outside of his marriage.
The 55-year-old Foo Fighters drummer, who was also in Nirvana in the Nineties, issued a statement admitting cheating on his loyal wife Jordyn Blum, 48, who he has been married to since 2003 and shares three daughters with.
Taking to Instagram to share the surprise news, Dave said in a statement: "I've recently become the father of a new baby daughter, born outside of my marriage. 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. We're grateful for your consideration toward all the children involved, as we move forward together."
But the question on everyone's lips is, who has Dave fathered a child with? Here's what we know about the mystery woman so far....