Joshua Bassett, Chris Sullivan and Garth Brooks also took part in the epic surprise.
Clarkson sang 'The Dance' during Brooks' Kennedy Center Honors tribute.
ET spoke with the honorees and guest performers ahead of the Kennedy Center Honors, airing June 6 on CBS.
ET spoke with the honorees ahead of the Kennedy Center Honors, airing June 6 on CBS.
ET's Rachel Smith spoke with Trishia Yearwood at her home about the new 'Trisha Yearwood Pet Collection,' out now.
The country singer's daughter talked to ET about her love for music.
ET spoke with Allie Colleen about growing up in a famous family and her new album, 'Stones,' out now.
The country star revealed that she's COVID negative and called her husband 'Superman' for keeping their loved ones safe.
The couple shared their diagnoses on Wednesday, and that they would be out of the spotlight for the time being.
Brooks performed 'Amazing Grace' following Lady Gaga's rendition of the national anthem.
On Wednesday, Joe Biden was sworn in as the 46th President of the United States and J.Lo, Lady Gaga and Garth Brooks performed.
From fist bumps to singalongs, there was joy in the air as Joe Biden was sworn in as America's 46th president.
The country crooner last performed at a presidential inauguration in 2009.
ET is breaking down everything you need to know about the stars who will be appearing tomorrow during the Biden-Harris inauguration.
