The first one of course, the big surprise, the bride's tiara. I have no idea of its provenance...
Pss Tatiana of Greece tiara, a small fringe type tiara.
Pss Úrsula von Bayern wore a tiara with the center elemento very similar to the Spencer diamond tiara although smaller.
Pss Anna von Bayern wore a small spyke tiara I've never seen also. The Bayerns recently sold their most important jewelry, the spanish sunrays tiara, heirloom from Infanta Paz, and the fabulous amethysts set. I have no idea if they already had these small tiaras or bought them at some point.