Adele and Lady Gaga Hang Out Backstage at the GRAMMYs -- See the Adorable Instagram!

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What's the exact opposite of performing with Metallica? Probably this.

Lady Gaga and Adele hung out together backstage at the GRAMMYs on Sunday, sometime after Gaga's glitchy heavy metal debut and sometime between Adele sweeping every category she was nominated in and performing two and a half times and making Beyoncé cry.

"This one," Gaga captioned the photo. "killin it tonight like girls do"

WATCH: Adele Drops F-Bomb After Briefly Stopping George Michael Tribute, Still Delivers Powerful Performance

This isn't two divas passing in the night -- Gaga and Adele have been friends for a while, even sparking pre-25 and pre-Joanne rumors that the two were collaborating on music together after Gaga shared a selfie from their "bro-down."

Adele also recently gushed about Gaga's Super Bowl halftime show, Instagramming a shot of TV screen and writing, "Lady you SMASHED it! Totally nailed it"

Now, back to those collaboration rumors. Can we get something on the books for 2017?

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