Credit: Deano/Splash News

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.

"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."

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

"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.