Shelton then joined Stefani on stage as the band played the song, and the two shared a kiss at the end of Stefani's set. After all, she was just in Las Vegas to show her support to Shelton.
Clarkson also performed at the Planet Hollywood on Sunday.
"It's a great honor to be a part of this ACM flashback moment", Shelton said during his introduction of the unique collaboration performance. He was married to Lambert for four years before they divorced in 2015. Stefani, on the other hand, was with her ex-husband Gavin Rossdale. "I'm not the only one that thinks it!" AP photo Blake Shelton performs "I Lived It" at the 53rd annual Academy of Country Music Awards at the MGM Grand Garden Arena on Sunday, April 15, 2018, in Las Vegas.
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During her appearance on The Ellen DeGeneres Show, talk show host Ellen DeGeneres asked Stefani a similar question. Back in January 2017, the singer told People Magazine that she thinks Stefani "fits in" the country music world though she's a pop singer.
Last year, Shelton also denied that his relationship with Stefani started out of the blue. "I think about [marriage] all the time".
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Beattie said organisers had meant to spare athletes a long wait before entering the venue but had got the broadcasting decision wrong.