Celebrity Butts

Beyonce and Jay Z wasted a ton of money filming a full-length trailer promoting their On the Run Tour because all they had to say was ... BEYONCE SHOWS OFF HER BOOOOOOOTY!!!!

The couple kicked off their tour in Miami Wednesday night and the show-stopping moment was definitely when she performed the song "Naughty Girl" ... wearing a costume with the ass cut out.

This is the best video we've seen featuring Beyonce since ...

Courteney Cox just turned 50.

Former Playboy playmates Karissa and Kristina Shannon frolicked on the beach in the Pacific Palisades yesterday with some unusual beach accessories ... burgers and fries.

Hef's ex-girlfriends enjoyed an afternoon at Will Rogers Beach with a few Big Macs and a couple orders of fries. The girls have done a ton of growing up -- all over -- since their Playboy days in 2009.

It may seem odd to bring fast food to the beach, but who doesn't love a set of juicy buns?

Will Smith and Jada Pinkett Smith took their tight, toned bodies to the beach today in Hawaii -- proving once again ... Jada is the hottest 42-year-old mom in a 2-piece.

Mr. & Mrs. Smith had something for everyone -- her toned ass barely covered in a bikini ... and his ripped arms in a tank top.

If you're impressed -- you're not alone. 13-year-old Willow was there too ... and looked pretty awestruck by her parents' ridiculous physiques.

Will still rules in Summertime.

One thing Chris Brown may be done with is gangs, but gang bangers ... not so much.

Porn stars Alexis Texas, Bonnie Rotten, Alektra Blue and Sarah Jessie posed backside first for a pic at Chris Brown's Beverly Hills bash Thursday night.

Also on deck, porn star Kimberly Kendall -- who tweeted a pic of Chris dancing with her and a bunch of other hot chicks after blowing out the candles.

As we previously reported, T-Pain told us there was no weed smoking allowed at the party.

Porn star booty > smoking weed.

"Bad Girl Club" star Natalie Nunn saw the butt photos of Bradley Cooper and Jennifer Lopez and laughed ... then broke out this thong while partying on the beach in Miami on Thursday.

Jennifer Lopez had ass-on-parade during her first hometown concert in the Bronx -- but did Bradley Cooper, of all people, put her butt to shame? Only one can be the hands-down winner!

Actually, keep your hands where we can see 'em.

Jennifer Lopez did her first ever concert in her hometown of the Bronx last night, and she did not hold back the goods ... giving the crowd a view of her prized backside.

J.Lo's free show at Orchard Beach -- in advance of her new album coming out later this month -- featured actual singing and multiple costume changes ... most of which showed off her rear end, thankfully.

The butt show was clearly a response to the latest challenger to the ass throne ... Bradley Cooper.

Nicole Scherzinger did her best Jessica Alba impression over the holiday weekend, showing off her incredible bikini body aboard a yacht in St. Barths.

At 35 years old, the former Pussycat Doll still has several lives left in her.

PLAYGIRL wants a piece of "Game of Thrones" man-ass -- and balls ... but not just in a box.

Sunday night after stud warrior Daario Naharis dropped his drawers ... fans went crazy on social media and PLAYGIRL noticed. The consensus -- the hottest male ass ever on TV.

PLAYGIRL publisher Vincent Stevens tells TMZ there is now high, full-frontal demand, and his magazine is the perfect place to showcase Daario's goods.

So Stevens emailed actor Michiel Huisman -- who also played sexy music producer Liam on "Nashville" -- urging him to "correct the oversight" and pose naked.

We reached out to Huisman but he's the silent type.

Kendall Jenner definitely knows how to celebrate milestones on social media. Right after ringing up 10 million fools followers on Instagram -- she posted a video that would make R. Kelly proud.

What? We mean she did a little bump and grind. Sickos.

28-year-old Venezuelan fitness model/Instagram star Michelle Lewin reminded everyone that bikini season is almost upon us ... by wearing one in Miami this week in a way few can.

Ashley Tisdale celebrated her bachelorette party with pal Vanessa Hudgens on a huge yacht in Miami -- and Ash made sure to flaunt her ass in a tiny thong before it's, y'know ... locked down for life.

Thanks, bikinis!

The new Wonder Woman in Ben Affleck's upcoming "Batman vs. Superman" flick really could've used her golden lasso over the weekend ... to help extract a major wedgie from her butt.

Gal Gadot -- famous for her role as Gisele in the "Fast and the Furious" movies -- was out for a bike ride Sunday in Tel Aviv ... when she had to pick that scrunch in her bunch.

Kim flashed her engagement ring for photogs ... and then she gave 'em the same rearview wedding guests will see walking down the aisle -- and it's glorious.

Happy thong Thursday from Italian model Claudia Romani.

Claudia's known for her achievements in smoking hottery -- especially on Miami's South Beach.

Watch the video. Her qualifications speak for themselves.