Many of the celebs who have twins are older, and have therefore a higher risk of conceiving twins naturally, or of needing IVF. However in China, where there is the famous "one child policy" many women take clomid to increase their chance of a multiple pregnancy. I have also heard of women in this country and America buying climid over the internet for this very reason. I doubt many, if any, doctor would prescribe fertility drugs just to try and get a multiple pregnancy. It would be unethical as a twin pregnancy comes with a higher risk than a singleton one.

Twins are fabulous, I would not wish mine away. But the pregnancy was hard (and I had a low risk twin pregnancy and natural birth). My body has still not recovered and they will be 3 next month. TBH I doubt it ever will fully recover. Add to that the pain I was in, forcing me to rely on TV to babysit my older boys whilst I struggled to cope. I would think very carefully before taking any actions to increase your chance of twins.