Teen Mom star Amber Portwood is doing her best to stay positive in light of the series of nude photos that hit the internet Thursday.

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"I'm devastated that these pictures were stolen from my phone and sold by someone I trusted," Portwood, 20, tells MTV in a statement. "It makes me sad that anyone would do this, and I'm horrified that something so private is being shared publicly."

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The racy shots -- reportedly taken a few weeks ago -- feature Portwood flaunting her rear end and caressing her stomach.

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"It's been a difficult year, and I just want to focus on what's important in my life -- my daughter," Portwood, who recently reunited with her two-year-old daughter Leah's father, Gary Shirley, says.

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