Wiz Khalifa channeled his inner rock star at Amber Rose‘s birthday bash … belting it out for what turned into an epic karaoke performance!!!

In a video obtained by TMZ, Wiz sang his heart out to Kings of Leon’s mega-hit “Use Somebody” … and the crowd was lovin’ it!!

Wiz opened the doors of his swanky house in L.A. this past Saturday to celebrate his ex, Amber’s 40th birthday. A real mix of characters were in attendance … including Abimbola “Bola” and Olabinjo “Ola” Osundairo, A.K.A the brothers involved in Jussie Smollett‘s fake hate crime.

The Osundairo bros tell us they run in the same circles as Amber … and the party was awesome! It was a costume party with roughly 100 people in attendance … and Wiz’s house was decked out in Halloween decorations.

The party had all the staples of a great time, with delicious food and great music, including karaoke … where Wiz clearly stole the show.

For all you Wiz fans thinking there’s a switch from rap to rock in his future — well, just watch first.

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