Just keep it cool, and I would say, "Happy birthday" with a smile on my face. Dont ask her what she has planned. Simple.
I've a cool new jacket and I'm going to look HOT when she sees me. LOL
The kids have already said what she has planned. W is doing something boring with some happily married ladies who I know well and she pretends to like. Given how conscious she is becoming about getting older she might even be in a MLC.
Anyway, I'm going to have a great few days with the kids. I'm going to take them to buy their first games console.