Post Malone fell flat on his butt while attempting a backflip off a chair on Monday … slightly painful, unintentionally hilarious, all caught on camera during a live stream.

Watch the video … in the middle of a Twitch stream with xQc, the Grammy-nominated artist warns, “This is just an attempt,” before climbing onto his chair.

Before he can even properly push off the chair to start a flip, PM falls sideways right onto his bottom.

He admitted, “I actually hurt my wrist.” … and — no doubt — his pride.

The singer went on to blame it on the chair, saying it rotated.

Ummm … that’s not the only thing that went wrong there, bud.

The “White Iverson” rapper has been having a hard time staying upright lately.

He had an even more embarrassing incident during a concert in India earlier this month. While heading down the stairs of the stage after his set in Khanapara, he missed a step and tumbled backwards right onto his butt.

Guess it’s not how many times you get knocked down, but how fast you get back up!