Ever since her early days on American Idol, Carrie Underwood has been a stellar duet partner. Between her impressive vocal range and immense popularity, it's no wonder that pretty much everyone wants to sing with her.

While Underwood is somewhat selective about the artists with whom she chooses to duet, she doesn't discriminate based on star power; the country superstar has teamed up with both legendary performers and new faces. She's open to singing with artists from other genres, too -- and in one case, her duet partner wasn't even alive!

Of course today's country fans love Underwood's pairings with fellow modern hitmakers such as Miranda LambertBrad Paisley and Keith Urban. But it's Underwood's duets with legacy voices such as Willie Nelson and Vince Gill that really make listeners swoon. Still, perhaps her most surprising and astounding duet is one with the King of Rock and Roll himself.

Click through the photo gallery above to remember some of the best duets by and collaborations featuring Underwood and her famous friends.

How Well Do You REALLY Know Carrie Underwood?