How do I get my girlfriend to wear some make up when we go out?

My girlfriend is great and I love her to bits but she's also a bit of a tomboy. When we go out a always go all out to look my best for her and while she does look good she never wears any make up. She's a pretty girl but I think a bit of make up would make her look stunning (not like plastering her face with it, just some highlights).

i don't think she's against make up, I just don't think she's ever really tried it. How (if there's a way) do I ask her to wear some make up without sounding rude?
How do I get my girlfriend to wear some make up when we go out?
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