Sugarland will perform what they say will be a "unique version" of their hit song, 'Stay,' on Sunday's Grammy telecast. And the country duo refuse to let Sir Paul McCartney mess them up.

"When we're playing our song, he's the first guy in the first seat. How about that?," Kristian Bush tells The Boot, hanging out backstage at Grammy rehearsals.

"Right there, front and center. That's who we're in front of. No pressure though!" Jennifer Nettles jokes.

But Bush has a surefire way to avoid the pressure of playing with a Beatle watching you front row: "Just don't catch his eye, 'cause you're gonna flub a chord," he says to Nettles, laughing.

McCartney won't be the only rock icon there, as Robert Plant will also be performing. But with Plant now having some Nashville roots, due to his musical partnership with Alison Krauss, Sugarland has at least seen him up close, even if they haven't spoken yet.

"We walked by him at I think the CMTs or something and we're like, 'We don't want to be those people,'" Nettles says. "But we really, really do!"

Sharing a stage with the likes of McCartney, Plant, U2, Radiohead, Kanye West and Jay-Z, is something the duo is very excited about, as they get to be fans for a night.

"I think it's the best night of performance in all of music, because you do get to see so many different genres perform at the same time. Normally how would you be able to do that? Especially with our schedule, always on the road," Nettles says.

"This'll make up for a lot of missed shows," Bush adds.

Sugarland is nominated for three Grammy awards: Best Country Song and Best Country Performance by a Duo or Group for 'Stay,' and Best Country Collaboration for 'Life in a Northern Town,' with Jake Owen and Little Big Town.

"I bet if we win we cry!," Bush says in a special video on Sugarland's website.

The Grammys air live this Sunday at 8 PM ET on CBS.