Selena Gomez and Marshmello are working on music together! Out of nowhere, the duo announced that their collaboration, "Wolves," is slated to drop on October 25, 2017. Um, unexpected much? It all started when the EDM producer teased "the newest member of the mellogang." Turns out, it's our girl Sel!

She officially dropped the news by telling her fans to "meet the mellogang." (Her version of his signature mask was pink. Go figure.)

In the follow-up photo, the duo teased that their collab is called "Wolves," which fans can only presume is a song. (It's going to be a JAM, we can already tell.) Does this mean that a new album is coming soon?

As of late, the actress has been seen filming an untitled Woody Allen project in New York City, but we're excited to see her dip back into the music world! Over the summer, Selena underwent a kidney transplant due to her Lupus. The last song we've heard from her is "Fetish," and we can't wait to hear more!

So who is Marshmello? His identity is actually unknown, although we presume Selena might know…now. In all public appearances, he wears his signature mask. Bella Thorne's ex Blackbear once dressed up as Marshmello on one of their most famous dates — his look is that iconic.