Why are celebs suddenly having twins?

im just waiting for the new fad for celebrites to become having triplets, then you totally know the are on fertility drugs.. As for right now and the whole twin thing. I was thinking the same myself yesterday when I read about Charlie Sheen's wife.. I mean seriously?? It's getting a bit out of hand.. I definitely think most of them are using fertility drugs.. probably mostly due to the fact the probably try to 'schedule in' having a baby into their busy schedules and also some of them are 'older'. Sad part is some of them might be a geniunenatural occurancs of twins and they are getting overshadowed by the fakers!!