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The Coronation Street cast member made headlines last year when she became the second actress with a disability to join the show.
Melissa, who was born without her right hand and forearm, portrayed lesbian Imogen Pascoe in the ITV soap.
The 27-year-old has now joined the list of celebrities who have had intimate moments from their sex lives leaked online.
Having been targeted by hackers, the photos reportedly show Melissa engaging in intimate acts with her boyfriend, Matt Swain.
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Following the very public violation, the blonde actress has hit out at whoever stole the images.
Talking to Mirror Online, she said "This was an intimate exchange that took place privately between myself and my boyfriend.
"It is completely unacceptable when people have their privacy disrespected in this way."
However, Melissa — who has been vocal about the importance of women celebrating their bodies — was keen to find a positive amid the personal violation.
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“This was an intimate exchange that took place privately between myself and my boyfriend”
Melissa Johns
She added: "I am proud of my body. It is beautiful. And I am entitled to enjoy it and to have a personal and a romantic life just as all women - of all different body shapes and sizes - are entitled to do.
"Women get these types of photos leaked all the time, but what is more unusual is to see a woman with a disability depicted in this way.
"If any good has come out of this, it is to show that women with all different types of body shapes and sizes send photos, have sex lives, engage in intimate exchanges in the same way as everybody else."
Corrie star Faye Brookes
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Melissa reportedly decided to not go to the police, as the website hosting her images is in the US rather than the UK.
The disabled actress isn't the first Corrie starlet who has fallen victim to online hackers.
Earlier this month, Faye Brookes, 30, — who portrays Kate Connor in the soap — reportedly called in police after her sex tape was leaked online.
According to The Sun, a source said: "Faye is understandably devastated. Like any woman, she will be mortified that this footage is a few clicks away.
Daily Star Online has contacted Melissa Johns' representative for comment.