Britney Spears is trashing Selena Gomez for something she said 6 years ago -- even though signs point to them being pretty good friends today.

The singer delivered a bizarre message Tuesday that looks to be aimed in Selena's direction -- based on the caption anyway. BS cites a specific line Selena dropped at the 2016 American Music Awards, which references women showing their bodies on social media.

She writes, "Don't you just love the nerve of women who stand firmly getting awards and speak on their beliefs about not showing their bodies on Instagram ???!!!!! They say "This is NOT something I would do" yet those women are the very ones who get 4 million dollar budget videos made about sucking and licking on homemade ice cream!!!!"

Britney goes on to say she thinks it's hypocritical for someone engaging in a sexually suggestive music video to criticize others for showing off their curves for the Gram.

The clues she mentions all point to Selena. Like we said, SG's the only person in recent memory who touched on "bodies on Instagram" while also going on to star in a 2020 music video featuring ice cream cones. The song is "Ice Cream" by K-Pop girl band BLACKPINK.

The IG post is still live on Britney's page, but she's edited the caption to just show 3 roses.

Selena's loyal fans definitely see it as a diss, and they're telling Britney to back off. Frankly, her attack seems to be coming out of nowhere ... and the even stranger thing is Selena was one of a few celebs who attended Britney's wedding this year.

Of course, we know Britney's fully leaned into posting her nudes online ... despite controversy it's stirred, especially among her own family members.

As usual, it's hard to make sense of Britney's POV. There is a trend, though ... less and less people on her side as she posts some weird and unprovoked hot takes.

Selena, for her part, hasn't responded to this. Something tells us she won't.

Originally Published -- 7:04 AM PT