according to Wikipedia's description of "Joy To The World:"
"A troubled teen collapses during her high-school Christmas program; Foreman and Thirteen learn more about each other as they work together on the Huntington's disease drug trial; House gives and receives holiday gifts, leading to team speculation; and Cuddy receives a gift as well. "

Personally, I didn't know that House was giving a gift. I knew he was going to receive one, as well as Cuddy, but I didn't know that he was giving one. This only feeds to our belief that Cuddy's gift is from House, huh? =D

I'll feel silly if everyone already knew about this...haha