To some fans, Jon Bon Jovi will "Forever" be a 1980s rockstar. But these days, this father of four is enjoying the newest band member, a new granddaughter.

On Aug. 21, the singer's son, Jake Bongiovi, and his wife, "Stranger Things" actress Millie Bobby Brown, announced that they’ve adopted a baby , making Jon a first-time grandfather.

On an Instagram post , the couple wrote: “This summer we welcomed our sweet baby girl through adoption. We are beyond excited to embark on this beautiful next chapter of parenthood in both peace and privacy.”

Along with an illustration of a willow tree, they signed off with, “And then there were 3. Love, Millie and Jake Bongiovi.”

Just five months ago, Brown, 21, shared she looked forward to expanding her family , saying on a March 10 episode of t

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