Princess Kate and Andrew Lloyd Webber opened the Eurovision Final in Liverpool by playing the piano

Eurovision viewers were stunned on Saturday when the Princess of Wales and Andrew Lloyd Webber appeared in the final’s opening sequence.

Kate, 41, made a moving tribute to Ukraine as she played the piano in a stunning opening sequence for the grand final, which took place at the M&S Bank Arena in Liverpool.

She actually appeared from Windsor Castle in a pre-recorded clip, with her appearance on the BBC program Top Guarded Secret.

Kate looked absolutely gorgeous in a one-shoulder blue Jenny Packham dress — to match the Ukrainian flag — as she played the piano in a short 10-second interval.

Composer Andrew, 75, also made a surprise appearance in the opening sequence as he also played the piano and smiled at the camera in another previously filmed clip.

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Both showed their talents as last year’s two Ukrainian laureates, Kalush Orchestra, delivered a stunning opening number, played to an estimated audience of 160 million people worldwide.

And viewers were absolutely blown away by the double veil look, praising both Kate and Andrew for appearing at the popular annual song contest.

One fan wrote on Twitter: “I didn’t have Andrew Lloyd Webber and the Princess of Wales in my #Eurovision bingo card.”

Another commented: “Respect, Andrew Lloyd Webber,” while a third tweeted: “Always stylish, well done.”

A fourth added: “A real surprise at the #Eurovision prologue with Kate Middleton playing the piano.”

They weren’t the only stars to appear in the moving rendition of Stefania, Kalush Orchestra’s winning song last year, with the performance also featuring Joss Stone and Sam Ryder.

Liverpool are hosting the competition on behalf of war-torn Ukraine, who won the competition last year, and fans across the UK have shown their support for both countries.

Hosts Graham Norton, Hannah Waddingham, Alesha Dixon and Ukrainian rock star Julia Sanina welcomed thousands of fans to the Grand Final as it kicked off.

The Grand Final will see UK’s May Müller finally take to the stage. After months of preparation, the North London star will finally perform her song, I Wrote a Song, to an international voting audience.

The singer, 25, is hoping to continue the success of last year’s UK entry Sam Ryder, which finished second behind Kalush Orchestra.

But the UK expat will have to beat the odds if she hopes to secure victory.

She is currently ranked 10th to win at odds of 40/1. Sweden is the favourite, followed by Finland and Ukraine.

May said she was also moved to see “the number of Ukrainian flags on the streets as there are British flags”.

She added, “That’s what Eurovision is about, it’s about people supporting each other.”

Twenty-six acts will be presented, as well as appearances from former UK Eurovision winner Katrina Leskanich of Katrina And The Waves.