If it's a party, do we get to play Postman's Knock and Doctors and Nurses? And, of course, a party means someone's just got to throw up.
Or is that youthful exuberance now behind the US of A and she's got to the stage where a bit of judicious fibbing about the age comes in, together with a tendency not to want to make too much fuss about birthdays. "39 again? How lovely for you!"
Or is it the best of all - a nice meal and a few drinks in good company?
Whatever, Happy Birthday the lot of you!