Birthday is truly the only single from Prism that DESERVED to be huge. Dark Horse was obviously a hit but I didn't think it was that damn good and don't get me started on Roar
It's a struggle because I want to be mad at her for dragging Birthday + Let There Be Love, but she didn't lie. I mean, she wrote them, they're great songs that deserved to be huge, but neither got the treatment they deserved.