Billie Joe Armstrong (@billiejoearmstrong on Instagram)

Green Day is very likely back in the studio, based on frontman Billie Joe Armstrong’s recent studio pic. Green Day also might be working with Black Eyed Peas frontman, based on Armstrong’s latest pic. Is this the E.N.D. of pop-punk as we know it?

To be fair, the Monday night photo could be totally innocent (gotta love that “Bill and Will” caption!), and it’s hard to tell where the two music stars snapped the shot. Maybe they were just grabbing a bite to eat and discussing how great the mid-‘00s were!

If you haven’t heard, Armstrong called for the end of the term “pop-punk” at the end of 2015, days after Green Day dropped a surprise Christmas tune. There’s a chance that the band drops the pop-punk and picks up the Elephunk.