TMZ Live: Gladys Knight Calls In ... Harvey & Charles SING BACK-UP

What's the greatest Motown song of all time -- tough question ... but we got one of the greatest experts ever to weigh-in ... Gladys Knight. She's also got two new Pips -- Harvey and Charles sing back-up ... or at least they try. And if that wasn't…

Source: http://www.tmz.com/2012/02/21/tmz-live-rihanna-chris-brown-duet-confederate-flag/

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