Where does this quote come from?

[elbenprincess]

"As one of the members of the royal house of Finwë and having the blood of the Vanyar from her paternal grandmother, Indis, she was often called the fairest of all Elves, be it on the shores of Aman or of Middle-earth."

I read this at wikipedia and wondered if this is fan made or stated by Tolkien. Maybe someone read this in one of the books? The fairest would be Luthien actually, but in my eyes Galadriel is more beautiful anyway, but thats not the point