Hollywood is pretty much known for acting. If it is a smaller scaled party, maybe a game of charades? lol I know that's not the most original game out there but as long as whatever they have to act out is fun then it should go over well.
If there are more people attending you could have celebrity trivia related to you. Who ever seems to answer the fastest, or closest to what you'd answer would win the prizes. Questions could be things such as what's your favorite movie, who would you want as your love interest in a movie, things like that. That way you can quiz people on how much they know you, the birthday girl.
Whatever you decide to do, hope you have a lovely party.