Look, bitch: Britney Spears is tired of people thinking she doesn't sing live and giving her no credit while she's out there busting her ass every night.

So much so, in fact, that the Glory pop icon just took an opportunity to clap back at The Haters in vocal form.

In what appears to be a very Deliberateney move, the Undisputed Princess of Pop™ was performing at her concert in Singapore on Friday (June 30) when she took a moment to wish her bodyguard, Jacob, a happy birthday.

"I have a really special friend tonight. He's been with me — I'm gonna cry — for like five years," she announced to the crowd. "He's one of my favorite people. His name is Jacob. Everyone, let's sing happy birthday!"

But what came next wasn't just any ol' friendly rendition of "Happy Birthday." No, ladies and gentlemen: She's got a little song to sing. This was a full-bodied, soul-stirring, ...Baby One More Time-era 1999 Spearitual vocal performance from deep in her heart.

You best trust and Believe (available at Walmart) this impromptu vocal moment was her way of responding to the backlash she received for that Israeli interview.

"A lot of people think that I don't sing live. I do usually — because I'm dancing so much — I do have a little bit of playback, but there's a mixture of my voice and the playback. It really pisses me off, because I'm busting my ass out there and singing at the same time, and nobody ever really gives me credit for it. You know?" she vented to Channel 2 days before.

A live vocalist. You were saying?

Fun fact: Britney Spears famously invented the song "Happy Birthday," when she sang the song to L.A. Reid on X Factor USA back in 2012.

Britney Spears Through the Years: