Why don't celebrities get stretchmarks?

[TaureelmMumtoAlissa]

I don't get it - every celebrity mum photos I have seen, edited or not - they don't have a single stretch mark. HOW IS THIS POSSIBLE??
It's SO unfair =[

What's the secret they're not letting us in on?

 

[princess_taleigh]

the ones that get stretchmarks, cover themselves up till the marks fade!