The 'Wide Awake' singer was thrilled to hear that the boy band enjoyed their viewing of her 3D concert movie Part of Me, after seeing their praise via Twitter.
"Saw the katy perry movie earlier. Wow, what an amazing woman. True talent!" the group posted following a recent screening.
Perry joked that she finds the teens attractive, but that their young ages deter her from having more than a minor crush.
"They went and just saw the movie and tweeted some really nice things about it. They are very cute boys but very illegal for me," The Irish Independent quotes her as saying.
Perry has previously spoken out in support of One Direction, telling The Irish Sun that she is a "big fan" of the group and proud of their success - especially one member in particular.
"They've been so sweet to me every time I meet them, they're like the biggest thing in the world right now. I'm thrilled for the success they're enjoying and love hanging out with them - [Niall Horan] is just lovely," she said.
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Watch an exclusive clip from Katy Perry's 3D concert movie Part of Me below: