I was in an awkward situation, what would you do?

[GemKitty]

So I was @ school and I sit right next to the electricity outlet. so sometimes I take advantage and plug my straighter in or my phone. Anyway so this girl in my class I hardly ever notice her to be honest. she asks me for a favor to charge her phone. so she hands me her phone and on the background, theres a topless picture of her. I was obliviously stunned (N not alot amazes me) But I couldn't believe she handed it to me with that pic as her background. What should I say or do? Did she do it on purpose? I am honestly at a lost for words