Dia Frampton and her coach, country star Blake Shelton, performed the Tom Petty song 'I Won't Back Down' as their duet on the final competition show of 'The Voice' tonight.

"It's the perfect song to sing on this last show," said Frampton of the Tom Petty tune prior to the performance. "'I'll stand my ground' is the perfect last lyric I'll want to finish on."

"I remember when I had that look on my face that Dia has when she comes out there," Shelton said of Frampton's eagerness. "I probably lost that along the way somewhere, and she's helping me find it again."

For the performance, the two appeared playing guitars while wearing matching black suits and Ray-Ban sunglasses -- looking like characters out of a Quentin Tarantino movie. Dia tackled the first verse, delivering the tune with a raspy sweetness. Shelton then showed of his powerful country twang on the second verse.

The pair shared vocal duties on the chorus and even threw in a little bit of matching choreography with a couple of head nods here and there. It was a nice performance that showed off Frampton's confident ability to not over-sing, and Shelton's restrained country crooning.

Watch Blake Shelton and Dia Frampton Perform 'I Won't Back Down' on 'The Voice'