BY teaches that our spirits were the result of celestial bodies (plural).
Brigham Young, "Philosophy of Man Upon The Earth—the Great and Grand Secret of Salvation—Are We One—Nature of Stewardship—Increase of Temples—Hear Ye, Mothers," Journal of Discourses, 26 vols. (Liverpool: Joseph F. Smith, 1877), 18:258
[S]pirits were begotten, born and educated in the celestial world, and were brought forth by celestial bodies.