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Victoria Justice has vowed to discover the identity of a thief who stole her phone as personal photographs from the device have appeared online.

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Photos featuring the former child star, who rose to fame on Nickelodeon TV shows "Zoey 101" and "Victorious," wearing a revealing bathing suit hit the web on Thursday, and Justice has now addressed the images, saying they were taken from her cell phone.

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In a series of posts on her Twitter page, she writes, "My phone was stolen & some1 (someone) leaked this. Wasn't meant 2 (sic) be 'sexy', I took it as a joke cuz (because) I look like an 80s aerobics instructor.

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"Hacking & stealing is not cool. Respect peoples (sic) personal property... I would never post a picture of myself like that. I'm not taking this lightly & I will find out who stole my private property."