Vienna Karaoke You Don't Know Jack, Jake

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.