The Holland striker scored from close range on three occasions to halt United's title charge, but owed a lot to Luis Suarez who laid on two of the goals for him.
"It's perfect," Kuyt told Sky Sports 1.
"You dream about the hat-trick and to do it against United is the best feeling ever. I'm more than happy but I have to thank Luis because he played great and created two of the goals.
"They were quite easy goals, I used to score them in Holland when I played more like a striker. They count and I'm more than happy to take them."