Watch: Tyler & Underwood Preview 'Crossroads'


She's all country, he's a whole lotta rock n' roll, and this weekend Carrie Underwood and Aerosmith frontman Steven Tyler will present a must-see edition of CMT Crossroads at the Pepsi Super Bowl Fan Jam.

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ET's special correspondent Christina McLarty dropped in on the superstars as they prepped for this Saturday's spectacular show, airing live from the Indiana State Fairgrounds in Indianapolis, Indiana.

As Crossroads prides itself on blending the talents of unlikely artists, Carrie and Steven's pairing makes for a unique mix of rock and country that Tyler himself admits he quickly became very fond of.

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"I'm singing these lyrics that are taking me inside my mind, country-western lyrics… They're so deep, it knocked me right back to reality," says the Aerosmith rocker, in reverence of the set list he will be performing with Underwood this weekend.

"I don't know how you can't have fun with the songs we're doing," agrees Carrie of her top-secret line-up with Tyler.

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While the duo's focus is aimed on Saturday's show, they have not forgotten the weekend's big attraction, Super Bowl Sunday. Tyler rocked the halftime show in 2001, and when asked if he had any advice for Madonna this year, Steven told ET he is quite confident the legendary performer will knock this year's festivities right out of the park.

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"She's a big girl, she's a very smart girl, she's done stadiums like that forever," says Steven. "It's probably nothing to her, yet she's such a diva and she's such a great artist. She's going to do something that we don't know about, and we're dying to find out."

Don't miss Steven and Carrie as they perform live from the Pepsi Super Bowl Fan Jam Saturday on CMT Crossroads.