I think this could be related to "Celestial Empire", one of the old terms for China. A celestial bride is usually a divinity or something like a divinity, married to a shaman or one of faith, in terms of religion.
Acording to this page,
the term "celestial bride" is used in a derogatory sense aimed at the Westen men, looked down on because:
So just think, there ARE western men who aren't out there to take home a celestial bride, and frankly, I think that most of the ones that do only do it cause they can't get a girl in their own country and have to rely on their 'western' status to hook it up.