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It was a reunion nearly 20 years in the making, with Carrie Underwood and Bo Bice sharing the American Idol stage once again.

Underwood, 42, and Bice, 49, were the last two singers standing in American Idol Season 4 back in early 2005, though Underwood famously was victorious.

Part of the finale nearly two decades earlier featured host Ryan Seacrest revealing that they both won 2005 Ford Mustang convertibles, which they had a bit of fun with on Sunday night's episode.

After playing that flashback clip, Carrie was seen driving around her fellow judges Lionel Richie and Luke Bryan, along with Seacrest, in that very same car.

'So, guys, we are in the exact car that I won 20 years ago,' Underwood said, as the other judges praised the condition of the car.

Bryan noticed it has a CD player, though Underwood said she's never used it, but when they played the disc inside, it played the Bo Bice version of Inside Your Heaven.

It was a reunion nearly 20 years in the making, with Carrie Underwood and Bo Bice sharing the American Idol stage once again

It was a reunion nearly 20 years in the making, with Carrie Underwood and Bo Bice sharing the American Idol stage once again 

While Bice wasn't featured at the auditions for Sunday's episode of Idol, Bice and Underwood posed for a photo, wearing the same clothes from the video

While Bice wasn't featured at the auditions for Sunday's episode of Idol, Bice and Underwood posed for a photo, wearing the same clothes from the video 

Part of the finale nearly two decades earlier featured host Ryan Seacrest revealing that they both won 2005 Ford Mustang convertibles, which they had a bit of fun with on Sunday night's episode

Part of the finale nearly two decades earlier featured host Ryan Seacrest revealing that they both won 2005 Ford Mustang convertibles, which they had a bit of fun with on Sunday night's episode

Underwood mentioned, 'we both released Inside Your Heaven as a single. Why is Bo's version in my car?'

They cut to Helena, Alabama - three hours straight south of Nashville - where Bo was driving what seemed to be his car, with Carrie's version of Inside Your Heaven.

The long-haired singer - clad in a grey t-shirt, black pants and black shoes -  said, 'Sing it girl,' as they showed the license plate reading, 'S4Winner,' indicating he had swapped cars at some point.

'I got you Carrie, yeah!' he said while driving away, as the brief bit came to an end.

While Bice wasn't featured at the auditions for Sunday's episode of Idol, Bice and Underwood posed for a photo, wearing the same clothes from the video.

'Hey @bobiceofficial #CUonIdol tonight,' Underwood said, sharing a snap of them on the new Idol set, plus one of them from the Season 4 finale 20 years earlier.

Just weeks after the Idol finale, Underwood released her version of Inside Your Heaven, which would later be included on her studio album debut Some Hearts.

Her version of the single debuted on June 14, 2005, premiering atop the Billboard Hot 100 singles charts and topping the Canadian singles charts too.

Underwood mentioned, 'we both released Inside Your Heaven as a single. Why is Bo's version in my car?'

Underwood mentioned, 'we both released Inside Your Heaven as a single. Why is Bo's version in my car?'

They cut to Helena, Alabama - three hours straight south of Nashville - where Bo was driving what seemed to be his car, with Carrie's version of Inside Your Heaven

They cut to Helena, Alabama - three hours straight south of Nashville - where Bo was driving what seemed to be his car, with Carrie's version of Inside Your Heaven

The long-haired singer - clad in a grey t-shirt, black pants and black shoes - said, 'Sing it girl'

The long-haired singer - clad in a grey t-shirt, black pants and black shoes - said, 'Sing it girl'

They showed the license plate reading, 'S4Winner,' indicating he had swapped cars at some point

They showed the license plate reading, 'S4Winner,' indicating he had swapped cars at some point

Just weeks after the Idol finale, Underwood released her version of Inside Your Heaven, which would later be included on her studio album debut Some Hearts'

Just weeks after the Idol finale, Underwood released her version of Inside Your Heaven, which would later be included on her studio album debut Some Hearts'

She would ultimately win Billboard Awards for Top-Selling Country Single of the Year and Top-Selling Hot 100 Song of the Year.

Bice's version debuted one week later on June 21, finishing its first week on the Hot 100 in second place. 

They would both embark on the American Idols Live! Tour 2005 along with the other Top 10 finalists.

Bice released three albums - 2005's The Real Thing, 2007's See The Light and 2010's 3. 

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