Some private photographs of singer-actress Demi Lovato have reportedly been circulating on a number of adult websites since the last few days.

One of the images shows Lovato sporting an unzipped hoodie. She can be seen smiling while lying on a bed. But it is unclear when the photograph was taken, reports aceshowbiz.com.

Responding to the leak, Lovato posted on Twitter: "I love how everyone's freaking out about one picture. It's not nude and it's just cleavage. Besides the world has seen me nude by choice before."

The leak comes three years after Lovato became a victim of 'The Fappening', a mass attack on celebrities' iCloud accounts.