Watch pop star Demi Lovato ‘knock down’ Sylvester Stallone while boxing

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Sylvester Stallone has taken some of the best shots boxers have received as Rocky Balboa … and kept on going.

The actor's chin must be softening with age as pop star Demi Lovato was able to “knock down” Stallone during a training session at  Jay Glazer's Unbreakable gym on the Sunset Strip in Hollywood.

The pop star backs quite a wallop. Which is no surprise, considering she is known for her mega-hits.