Miley Cyrus -- Does This Make My Ass Look Good?

Miley Cyrus' ass flipped a metaphorical middle finger to the world this weekend ... 'cause her cheeks were on full display despite the post-VMA backlash against it.

Miley flashed her rear-end to the crowd, repeatedly, during her iHeart Radio performance in Las Vegas ... proving she just doesn't care about all the people who said her ass was flat during that Robin Thicke debacle.

To be honest ... the butt does look fuller, but still below the Gaga standard.

Just for good measure ... Miley also served up a heaping dose of camel toe.

Miley's crotch don't give a f**k.