Character actor and comedy sidekick JOHN C. REILLY finally takes center stage as a JOHNNY CASH-style performer who vaults to superstardom in 'Walk Hard: The Dewey Cox Story,' and ET was at the star-studded Hollywood premiere at the world-famous Grauman's Chinese Theatre!

The highly anticipated premiere brought out stars, including JACK BLACK, JENNA FISCHER, WILL FERRELL, and JOHN MAYER.

'Walk Hard: The Dewey Cox Story,' hits theaters December 21.