Lyrics: "I wore Louboutins before they knew what they was/They like, 'Louis Vuitton?, Naw, uh huh, cuz'/That's when I realized they didn't know what they was"

Pharrell is a fan of Louis Vuitton, but he probably hit them with the Jay Z laugh here.

Anyway, the funny thing is, there are (probably) still some people who mistake one for the other.