The 24-year-old pop beauty - who is dating MMA fighter Guilherme 'Bomba' Vasconcelos - also joked about how there are already images of her showing off her ample assets widely available to the public including a previous shoot for Vanity Fair magazine.
She added in another tweet: "Besides the world has seen me nude BY CHOICE before.. #vanityfair #nicetry #cleavagegameonpoint #myboobsarenteventhatbig #angles. (sic)"
According to various reports, Lovato was seen posing on a bed in an unzipped hooded top in the shot.
However, it's not the first time the brunette beauty has been caught up in a photo hack.
In 2013, pictures surfaced of her in bed with her ex-boyfriend Wilmer Valderrama, which were reportedly meant to only be shared with her partner.
At the time, the hacker told RadarOnline: "These are Demi. The collection I have show some nude, including face, some including parts of the body Demi is known for - tattoos, butt, chin.
"Then, I have pictures of her getting rowdy ... I can guarantee you these photos are legitimately of Demi."
Lovato joins a long list of celebrities who have been targeted by online bullies including most recently Beauty and the Beast star Emma Watson, Mischa Barton and Amanda Seyfried.