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Zooey Deschanel is being sued over a horse ... of course, of course ... by a woman who claims the actress rode the animal so damn hard, she broke him ... this according to a lawsuit obtained by TMZ.

The "New Girl" actress is a hardcore equestrian -- competing in events all the time -- and allegedly "leased" a show horse to ride for $13k back in 2013.

In the suit, the woman who owns the horse, Patty Parker, claims Deschanel signed a horse contract ... promising not to overwork the stallion (named Literati) with restrictions that included "no more than 3 jumping lessons per week."

But Patty says ... when Deschanel returned the horse ... it was a shell of its former self -- "injured and unusable." Sad.

In her suit, Patty says Literati needed serious medical attention -- and claims it's on Zooey to foot the massive veterinary bills.

We reached out to Zooey for comment. Did we get a call back? Neigh.

Former "Game of Thrones" hunk Jason Momoa took his man muscles down to Rio de Janeiro ... reminding us why he's the perfect choice to play Aquaman.

Karrueche Tran is a single woman -- at least until she gets back together with Chris Brown for the umpteenth time -- but in the meantime, she's flaunting her single body all over Miami.

It's not hard to see why Chris kept going back.

Justin Bieber hit the bottle a little too hard -- as in the bottle of hair dye -- and he's now emerged as a platinum blond version of himself.

The Canadian pop star, and super-expensive car enthusiast, debuted his new lighter looking locks over the weekend ... during the ribbon cutting ceremony for a West Coast Customs car shop in Burbank, CA.

Whatever you might think of Justin's new 'do, you can rest assured ... Portia de Rossi probably loves it.

As the saying goes ... where there's smoke, there's Miley Cyrus -- and this time her bf Patrick Schwarzenegger was there too for a suspicious-looking toke break in Miami Thursday.

Miley and Patrick stood on a hotel balcony ... smoking his and hers blunts in plain view of cameras.
No way to tell from the pics exactly what they lit up -- so draw your own conclusions.

The couple's down in South Beach for the Art Basel show ... where clothing is optional. At least for Miley.

Miley Cyrus donned a silver wig to match her silver pasties when she showed up Wednesday night to perform at Art Basel in Miami ... with BF Patrick Schwarzenegger in tow.

Miley performed mostly covers -- Led Zeppelin, The Beatles, Johnny Cash -- and mocked her own music, saying, "You thought (Art Basel) was a respected place where you could escape me."

One thing's for sure ... the Kennedys are having fun conversations today.

Actress/singer Zoe Kravitz donned what barely qualifies as a bikini as she frolicked in the ocean ... Wednesday in Miami.

Nothing says you're 100% done with an ex like a laser burning his name away -- just ask Iggy Azalea ... who's finally getting her A$AP Rocky tattoo removed.

The "Fancy" singer went to the Beverly Hills office of tattoo removal king, Dr. Tattoff on Tuesday -- and walked out with a bandage on her left pinky ... where A$AP's name once lived.

Iggy got the tatt years ago when they were dating. When they split, she just had his name crossed out ... but now she's making a permanent change.

Finally ... room for some fresh Nick Young ink.

It's a question for the ages ... if you're going to run into two of your exes at a party, would you rather have two separate awkward encounters ... or an enormous one?

One Direction's Harry Styles chose the second option at Monday night's British Fashion Awards in London ... where he schmoozed Kendall Jenner and Cara Delevingne.

Styles was linked to Delevingne last September and Jenner just a few months later.

The scariest part for Harry ... Kendall and Cara came to the party together.

Comparing notes ... worst nightmare.

Cara Delevingne got something way better than a trophy at the British Fashion Awards ... she got a ton of action.

Nearly every photo of Cara -- now officially the World's Greatest Party Guest -- shows her all over a bunch of celebs. We won't spoil all of her encounters, but it seems Rihanna and Kendall Jenner were her favorite targets.

Freddie Prinze Jr. pushed his baby's stroller over the weekend, and the fact that he's walking is remarkable.

Freddie underwent spinal surgery late last month and he literally had to re-learn the art of walking. Freddie posted this over the weekend: "Learnin to walk again is like learning jiu-jutsu - 1 technique at a time."

So the fact that Freddie was up and about with his kids and wife Sarah Michelle Gellar is a big deal.

Prinze has been vague about the medical issue, saying he had "some disc issues that have been resolved."

Drew Barrymore had the worst Thanksgiving luck 'cause she got busted Thursday for the most heinous of offenses -- jaywalking!

Barrymore was leaving a yoga class Thursday when -- according to a photo agency -- an officer spotted her ignoring crosswalks ... and instead, opting to cross the street in the middle of a block. Yes, just like millions of other people in L.A. yesterday who didn't get caught.

Jeremy Renner could easily afford to pay someone to move his stuff ... but Wednesday in L.A. the actor showed he's a regular guy by doing some heavy couch lifting.

Hawkeye was spotted near his home moving furniture into a moving truck with one of his friends -- more than most celebs in Hollywood would do ... they have people for that.

Watch your back, Kim ... Khloe is coming for you.

Khloe Kardashian continued her all out assault on her sister's claim to the most colossal culo in Calabasas ... as she was spotted leaving a private gym Tuesday afternoon.

The spandex-clad profile is oddly similar to the one Kim showed off just a few months back.

The question is ...

Thanksgiving shopping can be difficult when the food you're shopping for weighs almost as much as you do ... a lesson Verne Troyer learned the hard way.

Despite having his trusty scooter to aid him, the "Austin Powers" star struggled to wrangle his bird, eventually resorting to just dragging his dinner-to-be across the sidewalk.

Twihards, prepare to be extremely jealous of FKA Twigs ... Robert Pattinson is showing solid PDA with his new chick -- grabbing a heaping handful of her cheeks.

The famous couple went to lunch Friday in L.A. and Edward proudly squeezed his new moon.

Still doesn't excuse his new haircut ... but we're guessing Twigs likes the doo -- and it probably helps RPatz play grab ass with her more often.

Glass is half full.