One of the Jackson 5's biggest hits -- "I Want You Back" -- was assassinated by former "American Idol" finalist Haley Reinhart ... who heinously botched the lyrics during a live performance, and TMZ has the footage.
You know Michael's famous words -- "oooh baby give me one more chance" ... but that's about all Reinhart remembered when she sang the Motown classic at the W Hotel in Hollywood last weekend.
In the video ... Reinhart forgets the lyrics in the VERY FIRST verse, momentarily gets back on track, and then flubs again -- all while peeking at the lyrics on her phone. Not that it helped.
Haley weathered a few hecklers -- like the dude yelling, "You don't know the words!"
Bright side? Her voice sounds great ... and her shirt is really shiny.
'Idol' Finalist Haley Reinhart
Slays Michael Jackson's
Super Famous Lyrics
8/29/2012 6:00 AM PDT BY TMZ STAFF
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