Carrie Underwood performs at Guns N' Roses concert, surprises crowd with 'Sweet Child O' Mine'

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Carrie Underwood rocked out with Guns N’ Roses concert. She belted the second verse and the chorus with Rose.

Underwood appeared suddenly from the side of the stage. She was wore a t-shirt with the Union Jack, the flag of the United Kingdom.

The Legendary rock band, including Carrie Underwood perform "Sweet Child O' Mine" and "Paradise City", Invited by Guns N' Roses at London's Tottenham Hotspur Stadium.

The group instantly energetic up the crowd after they started to play the very popular opening chords from “Sweet Child O’ Mine” during the show.

“Welcome to the greatest night of my life,” Underwood told the crowd at the time, according to Rolling Stone. “Give it up for Axl Rose!”

Underwood is also doing the promotion of her latest album “Denim and Rhinestones.”