After topping superstar songs by Jason Aldean and Toby Keith, Carrie Underwood fans will have to go through Hollywood to get her new single 'Two Black Cadillacs' to the next round of the Showdown. 'Nashville' star Hayden Panettiere returns to the Showdown today and tonight on Taste of Country Nights radio. 

'Telescope' is climbing its way up the radio charts and the singer/actress has some pull with fans of the ABC drama and her previous show 'Heroes,' but it remains to be seen if those fans will stand up and be counted in the way Underwood's faithful have in recent days. There are a few similarities between the two blonde singers -- even their songs. Both got their big break on Fox, and both singles are about cheating men.

Listen to clips of both Underwood's and Panettiere's songs and vote for your favorite here. You can vote once every hour online, so come back and vote often to be sure your artist wins. Hear the full versions of the songs tonight after 10PM on Taste of Country Nights. Help your favorite song win by placing additional votes at (888) 678-9995. Call as many times as you like! You can listen to the show online through any of the 41 radio stations that carry it. Voting will end tonight at 10:40PM CT.

Listen to a Sample of Carrie Underwood, 'Two Black Cadillacs'

Listen to a Sample of Hayden Panettiere, 'Telescope'

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Showdown Rules: The song with the most votes wins, and the winner goes on to face a new challenger in the next Showdown. Vote as much as once per hour online, and as much as you want by calling (888) 678-9995. If a song wins five days in a row, it will be retired into the Taste of Country Showdown Hall of Fame to allow for new songs to compete. Some songs will be considered for a second Showdown if voter turnout is healthy in a losing effort.