Vienna Girardi dragged Ray Charles into the middle of her breakup war with "Bachelor" ex Jake Pavelka last night ... because nothing says "I've moved on" like a strategically picked karaoke song.
TMZ snagged video of Vienna -- joined by her out of tune "Team Vienna" backup singers -- belting out "Hit the Road Jack" at Fiesta Cantina in West Hollywood ... where they cleverly changed the lyrics from Jack to Jake.
Oh. No. They. Didn't.