Looking for a song that popped into my head, as english isnt

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Looking for a song that popped into my head, as english isnt my native language I will try to say the lyrics (but they aren't the real lyrics...) in hopes for the answer:

She's beautiful but she doesn't know it,
she's really friendly but the doesn't know it.
She's a babe but she doesn't know it.
Shes the best but she doesn't know it.

It is something like that, i think the only thing that is for sure is the par of "know it" or maybe is another verb with "it" but it was refered to a girl.

I know it is hard with those clues but trying just in case.