10 CO-STARS WHO HATED EACH OTHER

Claire Danes and Leonardo DiCaprio may have played star-crossed lovers in "Romeo + Juliet," but the sparks certainly didn't fly on set.

Photo: 20th Century Fox

Actor Jason Alexander revealed this week how the cast of “Seinfeld” hated their co-star Heidi Swedberg — the actress who played Alexander’s fiancée Susan Ross — so much, they got show creator Larry David to kill her off.

The unfortunate Ross ended up being poisoned after licking cheap envelopes for invitations to her wedding to Alexander’s character, George Costanza. Her fate was sealed because other lead actors like Jerry Seinfeld, Julia Louis-Dreyfus and Michael Richards complained about her lack of on-set chemistry — not only with Alexander, but with them, too.

“They go, ‘You know what? It’s f - - king impossible, it’s impossible,’” Alexander told “The Howard Stern Show” Wednesday.

But the 55-year-old comedian is certainly not the first actor to bad-mouth a co-star. Here are nine other examples of on-set feuds:

Tony Curtis vs. Marilyn Monroe

Tony Curtis (left) and Marilyn MonroePhoto: AP

Although he later admitted having an affair with his 1959 “Some Like It Hot” co-star Marilyn Monroe, the late Hollywood legend Tony Curtis famously said, on being asked what it was like to kiss Monroe: “It was like kissing Hitler.” Speaking in 2008, the actor defended himself with, “I said it as a joke. I mean, it was such a darn stupid question, so I gave a stupid answer.”

Ryan Gosling vs. Rachel McAdams

Ryan Gosling and Rachel McAdamsPhoto: New Line

They may have gone on to have a real-life romance, but it wasn’t all hugs and kisses on the set of their weepy movie “The Notebook.” According to director Nick Cassavetes, Gosling and McAdamsdetested each other during filming. He described a day when Gosling flat-out refused to do a scene with his co-star. “He says, ‘Would you take her out of here and bring in another actress to read off camera with me?’” Cassavetes recalled. “I said, ‘What?’ He says, ‘I can’t. I can’t do it with her. I’m just not getting anything from this.’”

Anne Hathaway vs. James Franco

James Franco and Anne HathawayPhoto: EPA

There seems to be a pattern when it comes to Howard Stern baiting co-stars and getting them to diss each other. Speaking on Stern’s Sirius radio show in March 2013, Franco referred to his 2011 Oscar co-host as a “goody-two-shoes” and refused to defend her when the DJ talked about the “Hatha-haters.” He also confessed that the two didn’t talk much anymore.

Alec Baldwin vs. Shia LeBeouf

Shia LaBeouf (left) and Alec BaldwinPhoto: Startraks; Joan Marcus

Troubled LaBeouf sparked a row with his 2013 Broadway “Orphans” co-star Baldwinby tweeting: “The theater belongs not to the great but the brash.” Baldwin came back with, “I don’t think he’s in a good position to be giving interpretations of what the theater is or isn’t about.” LaBeouf was eventually fired from the show for “creative differences.”

Freddie Prinze Jr. vs. Kiefer Sutherland

Kiefer Sutherland (left) and Freddie Prinze Jr.Photo: FOX

In July 2014, speaking at a San Diego Comic-Con panel for “Star Wars: Rebels,”Prinze talked trash about his one-time “24” co-star Sutherland. The actor said: “Kiefer was the most unprofessional dude in the world . . . I think everyone that worked with him would say that.” He went on to admit that he stopped acting for a while after his “24” gig, which made him want “to quit the business.”

Patrick Swayze vs. Jennifer Grey

Patrick Swayze and Jennifer Grey in 1987’s “Dirty Dancing.”Photo: Artisan Entertainment

In his 2009 autobiography, the late heartthrob Swayze revealed that filming 1987’s “Dirty Dancing” with his love interest Grey was not a bed of roses. He said the actress would break down in tears at any criticism and disrupt filming by giggling too much. “She slipped into silly moods, forcing us to do scenes over and over again when she’d start laughing,” he wrote.

David Duchovny vs. Gillian Anderson

David Duchovny and Gillian Anderson in “X-Files.”Photo: Diyah Pera

Mulder and Scully may have reunited for next year’s “X-Files” reboot, but the actors who play them were never superfriendly. In a 2008 UK newspaper interview, Duchovny said of Anderson: “Familiarity breeds contempt . . . We used to argue about nothing. We couldn’t stand the sight of each other.”

Sir Anthony Hopkins vs. Shirley MacLaine

Shirley MacLaine and Anthony Hopkins in “A Change of Seasons.”Photo: 20th Century Fox

Strong-headed Hopkins had a spectacular personality crash with the outspoken MacLaine when the duo filmed “A Change of Seasons” in 1980. Asked what it was like to work with the veteran actress, he fumed: “She was the most obnoxious actress I have ever worked with.”

Claire Danes vs. Leonardo DiCaprio

Claire Danes and Leonardo DiCaprio in 1996’s “Romeo + Juliet.”Photo: 20th Century Fox

They may have shared some sizzling chemistry on-screen, but DiCaprio and Danes could not stand the sight of each other behind the scenes of Baz Luhrmann’s “Romeo + Juliet” in 1996.According to reports, Danes branded him “very immature” because of his on-set pranks, while he found her haughty and standoffish. The pair had a chance to work together 15 years later in “J. Edgar” — but Danes turned down the role.

Peter Sellers vs. Orson Welles

Peter Sellers (left) and Orson Welles in 1967’s “Casino Royale.”Photo: Handout

Ill feeling ran so deep between Welles and Sellers that, when the duo starred in the same movie, 1967’s James Bond spoof “Casino Royale,” they couldn’t stand to be in the same room. The long-suffering director Martin Campbell had to film each scene they shared separately, each opposite a mannequin. The performances were later stitched together in the editing suite.