The 3 singers joined forces for Country's biggest night in Nashville ... bringin' it all for a rendition of Kelsea's latest hit, "You're Drunk, Go Home." Needless to say, the crowd was lovin' it.
TMZ broke the story ... production sources for the CMAs told us the trio was planning the powerful performance last month -- doing a song all about female empowerment, and about guys who hit on women at bars after getting plastered.
As you know, Kelly and Carly both filed for divorce in June, 2020 ... Kelly from Brandon Blackstock after 7 years of marriage, and Carly from Michael Ray after less than a year.
As for Kelsea, she pulled the plug on her 5-year marriage with Morgan Evans -- the 2 finalized their divorce a week ago. She's been very open about how tough divorce can be ... recently posting an emotional confessional from the bathtub.
FYI -- Morgan was in the crowd during Kelsea's performance with Kelly and Carly Wednesday night ... though it's unclear if he was diggin' the tune or took it a little more personal.