In the short clip, the two appear to be lying in bed - their faces smeared with the character's iconic white, red and blue makeup thanks to the wonders of technology.
As an audio clip of the Joker's eerie laugh plays, the two rub their tongues together before bursting into laughter.
Unsurprisingly, many social media users aren't particularly into it.
One person tweeted: "This video of Miley Cyrus and Cody Simpson kissing with Joker faces on is terrifying."
Someone else wrote: "If I can't unsee @CodySimpson and @MileyCyrus making out with Joker face filters neither can you."
Another on Instagram told the pair to 'grow up'.
At the recent Los Angeles launch of the Tiffany & Co. menswear line, Simpson defended their choice to get together mere months after news broke of her divorce.
He told People: "The reason why it hasn't been a really crazy sudden thing is just because we've been friends for so long... [We] found each other again in a space where we're both not partying, working real hard, and it just keeps things healthy and it's good."
He continued: "I'm very happy. We are very, very happy. She's creative. She's very passionate about what she does, and I'm very similar in that sense. That's why we get along so well.
"We just have a ball, yeah, and that's the most important part of a relationship, you know?"
Cyrus and Hemsworth's split was confirmed in a statement to People back in August, when a representative for Cyrus asked people to respect the former couple's privacy.
The statement read: "Liam and Miley have agreed to separate at this time. Ever-evolving, changing as partners and individuals, they have decided this is what's best while they both focus on themselves and careers. They still remain dedicated parents to all of their animals they share while lovingly taking this time apart. Please respect their process and privacy."
Cyrus then broke her silence by saying 'change is inevitable' on Instagram, where she shared a photo of her enjoying some time in Italy with the mysterious caption: "Don't fight evolution, because you will never win.
"Like the mountain I am standing on top of, which was once under water, connected with Africa, change is inevitable.
"The Dolomites were not created over night, it was over millions of years that this magnificent beauty was formed.
"My dad always told me 'Nature never hurries but it is always on time'... It fills my heart with peace and hope KNOWING that is true. I was taught to respect the planet and its process and I am committed to doing the same with my own."
Featured Image Credit: Instagram