Michael Bublé is left speechless after 15-year-old fan sings flawless rendition of 'Feeling Good' at concert

Michael Bublé sure knows how to wow an audience ...

But it was a 15-year-old fan who stole the show during his concert in Birmingham in 2010.

Sam tore the roof off Bublé's LG Arena show after the 'Haven't Met You Yet' singer passed the microphone to him.

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Performing a stunning cover of Nina Simone's 'Feeling Good', Sam blew Bublé and the crowd away with his flawless vocals.

Together, the pair then belt out an amazing duet of the song making the crowd go wild.

The incredible clip has recently gone viral again, receiving more than 30 million views.