Billie Eilish has fan-girled over Britney Spears in the past, and Brit just returned the favor -- by posting a low-budget revamp of her controversial 2001 MTV VMA performance set to Billie's "Bad Guy."
Brit, who's still not ready to resume her career in earnest, hit her Instagram with the clip, in which she slithers around with a stuffed snake that's a little less scary than the live one she used when performing "I'm a Slave 4 U" way back when.
Eilish was left speechless by the display, hitting the comments with a simple "OMG."