T-Pain is famously known for using Auto-Tune, which made people assume that he couldn't really sing. Well, you know what happens when you assume, don't you? On Wednesday (Oct. 30), the rappa-ternt-sanga performed an NPR Tiny Desk Concert with just a keyboardist and no Auto-Tune. The result? Amazing.

He played a three-song medley of 'Buy You a Drank,' 'Drankin' Patna' and Rihanna's favorite tune, 'Up Down (Do This All Day).'

"I know everyone is wondering where the Auto-Tune is going to come from, it's OK, I got it here in my pocket," he jokes before his performance.

The 30-year-old crooner showcased his vocals skills while sitting on a stool -- unplugged. Props to pianist Toro for flipping the script and playing the chords from Warren G's 'Regulate' during T-Pain's rendition of 'Up Down (Do This All Day).'

T-Pain's fantastic performance left fans in shock and awe. So much so, they tweeted their amazement on Twitter. Clearly, everyone now knows how much of a talented singer he is with and without Auto-Tune. Check out the reactions below.