Celebrity Butts

What's good for the Miley is good for Vanessa Hudgens -- and GREAT for us to watch ... because the former Disney star opened up her own twerking clinic last night.

Vanessa performed with her new girl group YLA at Bootsy Bellows -- doing some singing, some dancing ... and then tried like Hell to shake her ass right out of her booty shorts.

Here's the thing ... Miley Cyrus caught major flack for displaying a lack of back during her VMA twerkfest. Does Vanessa's ass action deserve the same ... or does it get a pass?

Butt legends Kim Kardashian and Blac Chyna unleashed their A-bombs on an unsuspecting public this afternoon ... potentially scarring millions.

Kim was dressed like a fighter pilot -- armed with massive cleavage -- and convened with Nicki Minaj BC for a derriere summit (lunch date) of the Asses Powers.

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.

Here's Hayden Panettiere during a beach weekend in Miami with her fiance Wladimir Klitschko.

Mr. Pacino, your thoughts?

Today is Labor Day ... a time to honor the hard work and dedication of our labor force, and no one is workin' it harder than Alessandra Ambrosio -- and her perfectly sculpted ass.

Normally, we wouldn't feel so guilty checking out Gwen Stefani's incredible ass during a bikini-clad boat outing in France ... but her kid was there.

So, we put a black bar over his face.

And now we feel less guilty.

Enjoy!

We know Shakira's hips don't lie, but her ass is another story -- because even though she put on a sexy g-string to hit the beach in Hawaii ... she kept her goods under wraps!

Why so cruel, Shakira? TMZ investigates!

"Modern Family" star Sofia Vergara threw on her whitest bikini in Greece this week ... and flashed a vertical smile to all of the locals.

Sofia seems to be on a butt-flashing kick these days ... as evidenced by this, this, this and this.

God, we love you.

Here's a video of some chick with a GREAT ASS ... hangin' out with Memphis Grizzlies player Austin Daye in L.A. last week.

In less exciting news, it appears Daye got a parking ticket that day ... so that sucks ... but who cares -- LOOK AT THAT BUTT!

Miley Cyrus is God's gift to twerking ... at least according to the Ying Yang Twins who wrote an entire song about her booty-shaking greatness -- and TMZ has the track.

Kaine and D-Roc tell TMZ, they were inspired to make a tune in Miley's honor after learning she was a fan via Twitter -- and due to her transition from Disney princess to a derriere-popping powerhouse.

They tell us, "Our fans have been starving for some authentic twerk music. Seeing that Miley Cyrus wants to show the world she is grown by twerking, we decided to give her a little help."

You can listen to the lyrics yourself, but here are a few gems:

Do the Miley Cyrus rock wit it
Wiggle wiggle jiggle jiggle shake that s**t
All the n***as saying can she take that d**k?

Freaky b****es shakin ass on the pole
Do the Miley Cyrus b***h and get low

Miley Cyrus, ooh she wildin'
The way she shake her ass keep a n***a smiling'

With her camel toe she steal the show
Put her p***y in yo face like a freaky ho

Now, heeeeere's Miley (and her butt):

"Real Housewives of Bev Hills" star Mauricio Umansky snuck a handful of his wife Kyle Richards' butt on the way out of Bootsy Bellows nightclub in Hollywood last night.

This smokin' hot celebrity butt was spotted at a pool in L.A. this weekend ... but the question is -- WHOSE ASS IS IT???

Here's a tip ... she used to bang a SUPER famous person ... and then moved on to a not-as-famous person.

Now that model Elke the Stallion's massive assets are starring in the "Bubble Butt" music video ... she's proving big girls can make it in Hollywood too.

She's also balancing soda cans on her ass. So ... PROGRESS!

It's thick, round, wrapped in stripes ... and a total mystery. But just as TMZ's investigative team attempted to put a name to that sweet rear -- someone cracked it wide open. The mystery ... that is.

And now, definitive proof Arnold Schwarzenegger and Maria Shriver are definitely maybe BACK TOGETHER -- Arnold totally grabbed Maria's butt last weekend ... and TMZ has video.

As we reported, Arnold and Maria were attending their daughter Christina's graduation at Georgetown ... and while people were milling around everywhere, Arnold casually cupped Maria's backside. It's subtle, but it happened.

FYI, Arnold has been obsessed with Maria's caboose since he met her in the '70s -- in fact, Arnold recently told a story on "60 Minutes" about how he told Maria's mother her daughter had a "great ass."