Cher performs surprise cover of ABBA's 'Waterloo' LIVE on America's Got Talent

There's no denying America's Got Talent was a series of epic proportions.

But viewers of the show's 14th season finale were also given a very special treat when the one and only CHER gave a surprise performance!

The 73-year-old singer took to the stage to the delight of the crowd with a sizzling cover of ABBA's 'Waterloo.'

And she looked sensational in a plunging purple jumpsuit with a platinum blonde wig, which echoed ABBA's '70s costumes, as she belted out the 1974 classic.

Viewers at home took to social media to share their love for the legendary vocalist, with one fan tweeted: "I love @cher! Dang! Rocking a jumpsuit and singing Waterloo was just fun!! @AGT."

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Another exclaimed on Twitter: "Cher looked and sounded AWESOME on AGT tonight. #AmericasGotTalent".

"#AGT just got a whole lot more interesting with @cher rocking Waterloo!' someone else said.

The songstress was one of many high-profile entertainers to appear during the finale. Billy Ray Cyrus, Macklemore and Leona Lewis were among the other entertainers who took the stage.

What a treat!