One San Antonio teen knew how to get Michael Buble’s attention at a concert on Wednesday night.

Diego Martinez, 18, caught the Canadian crooner’s eyes by dressing up with a sign that said, “Let me sing with you!”.

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Buble signed the sign and then asked Martinez what song he wanted to sing.

“Ain’t That A Kick In The Head,” the teen replied.

Buble sang until Martinez surprised everyone by taking over from the artist.

“I just got a surge of energy,” Martinez told KENS5 news. “I don’t even remember what I felt right then and there — I don’t think I’ve even processed the whole thing yet — it was pretty nerve-racking, I’ve only seen this guy on YouTube and my iTunes playlists.”

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Martinez started singing jazz “after hearing the music of Michael Buble and Frank Sinatra.”

He added on Facebook, “It was an amazing evening! Truly a dream come true, still can’t believe it! I’m honestly at a loss for words.”