With Green Day front-man Billie Joe Armstrong headed to rehab, some are probably concerned about the guitarist's well being and fans are likely worried about the future of the band.  But, we are sure most people are worried about Armstrong's appearance on NBC reality show The Voice.

Don't worry.  He's still going to be on The Voice.

According to an NBC representative, Billie Joe's appearance as a mentor was recorded over the summer.  The rep said, "We're taped and all set."

Well, that is a relief.