Kesha's new song- take it off, does anyone recognise the tune?

I've read all the other answers and I'm sure they are right, but I have never heard of those songs and yet I recognised the tune too... I'm pretty sure it's a rip off of Tchaikovsky, or at least one of the clical pieces on my ipod. I'm screening my ipod to figure out which pieces and I'll get back to you.