We celebrated our son's 7th birthday there last year and have plans to celebrate his 8th at LTT this year. Now, I'm assuming that you are referring to the character dining of LTT.
The waitress brought out a card signed by all the characters and a cupcake with a candle; then the area of the restuarant we were in sang "Happy Birthday." It was very special and the characters made it extra special!
We are on a countdown for his birthday on the 7th of September.