While filming the upcoming flick "The Adderall Diaries", Amber Heard and James Franco have been reportedly cozying up to each other, both on and off the set, sparking recent breakup rumors between the actress and her fiancé Johnny Depp.

The latest buzz on the "Pirates of the Caribbean" actor has been centered on him becoming uneasy about tying the knot with his 28-year-old fiancé.

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According to The National Inquirer, Depp was jealous upon seeing photos that were taken of Heard and Franco getting comfy with each other by "cuddling and giggling".

While the actress claimed that she was just playing her character, the 51-year-old "Transcendence" actor was reportedly uncomfortable, "especially with James' reputation as a skirtchaser", a source claimed.

Aside from Depp's jitters, his own children with ex-partner Vanessa Paradis also had something to say in his wedding plans with Heard. The National Inquirer mentioned how the kids do not prefer the bisexual actress to be their stepmother.

Despite the actor wanting his children to be front and center when he takes Heard to the altar, it has been difficult for these kids to create a close bond with their father's bride-to-be.

Depp and Heard had plans for a fall wedding in Los Angeles; however, the couple has reportedly pushed back the ceremonies until the middle of 2015.

While costars Heard and Franco are keeping it snug and fueling up more speculations, the film revolves around a more serious theme.

"The Adderall Diaries:" highlights a man's search for his own identity while looking into a murder trial in San Francisco. The movie goes deeper into the story of a computer programmer who kills his wife, a Russian woman he had gotten to know through an online dating service.

Christian Slater, Cynthia Nixon, and Ed Harris are also featured in the movie.

Depp and Heard were last seen with each other at an Aerosmith concert in Massachusetts' Xfinity Center, where the actor took a guitar and played with the band on their song "Train Kept a Rollin'" to a screaming audience and his excited fiancé.

TagsJohnny Depp, Amber Heard, James Franco, Pirates of the Caribbean, Transcendence