Play makeup for boys?

So my 4.5yr ds has come downstairs wearing my makeup (foundation, mascara, lipstick) as he wanted to look 'pretty like me'! 
I have no issue with this whatsoever... ive told him not to touch my makeup again tho as it costs a lot of money but i will buy him some play/kids make up when i next go shopping just for in the house. 
Not looking for ww3 or telling me im wrong... just curious... if ur boy wanted to wear makeup... would u let them/buy them their own? 

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