Hillary Scott

Chris Tomlin and Lady Antebellum's Hillary Scott also join Rhett on the song.

It's beginning to look a lot like Christmas in country music!

Scott describes her twin blessings as "bringing more joy than I could’ve ever imagined." See how they've grown!

'Amercian Idol' has missed out on quite a few future stars over the years.

These two are so cute together!

Country stars share their memories of the terrorist attacks on Sept. 11, 2001.

D'awwww!

Mom, Mother, Mama, Mommy -- whatever she's called, she's played an integral role in these country stars' lives.