That's right nigga Mona Lisa can't fade her
I mean Marilyn Monroe, she's quite nice
But why all the pretty icons always all white?

from Kanye West (Ft. Elly Jackson, Jay Z & Justin Vernon) – That's My Bitch Lyrics on Rap Genius

Meaning

Jay’s having trouble coming up with hot historical-black-female icons to compare his new lady-friend to. I’m not, though — Lena Horne? Dorothy Dandridge? Pam Grier?

On a more serious note, Jay (who is certainly aware of these ladies) points out that American systemic racism means that examples of female beauty are almost always of the Caucasian persuasion (run a Google image search on “classic beauty” for some quick proof):

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