Why is it that so many famous people had or are having twins like Mariah Carey?

I have never heard of so many couples having twins.Jennifer Lopez, Dennis Quaid, Angelina Jolie, Celene Dion, Melissa Etheridge, Lisa Maria Pressley, Charlie Sheen, Julia Roberts, Sarah Jessica Parker, now Mariah Carey, and that list is just on the top of my head.
 
Lol, that's a good thing. Maybe they'll pass their talents down to not just one, but two children.
 
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