Mike Dirnt, bassist for Green Day, used Facebook and the band’s official site to tell the world that his wife is battling breast cancer.

Dear Green Day Family.

Recently my wife Brittney was diagnosed with breast cancer.

We have started our battle and she is enduring treatment as we speak! We want you to know that Brittney (Batmansmom) is strong and with the help of Amazing doctors, support from family, and positive thoughts/prayers from our Green Day family, SHE WILL BEAT THIS!

This is going to be a challenging year, but we are determined to get though this as quickly and openly as possible.

We love you all, and we will be checking in as best as we can, via Instagram: @batmansmom @mike_dossxx and www.GreenDay.com.

Rage and Love

Mike and Britt

Mike tried to keep things upbeat later in the day, posting a picture of his wife and their daughter and asking fans if he should shave his head if Brittney has to shave hers.

Dirnt married Brittney Cade on March 14, 2009. They have two children, Brixton (5) and Ryan (3).