Avert your eyes, "Jane the Virgin" fans, because we've got a potential spoiler for the fifth and final season ... even though it's probably not THAT much of a surprise.

If ya don't know ... in the very first episode of the show, Jane -- played by Gina Rodriguez -- accidentally gets pregnant via artificial insemination, and the unwitting biological father is her former teenage crush, Rafael -- played by Justin Baldoni.

Long story short -- the 2 grow closer as a result of their unique situation, and these pics seem to reveal ... it leads to marriage.

Gina and Justin were spotted shooting a wedding scene in L.A. Wednesday, and all signs point to Jane being the bride ... and Rafael being the groom.

Now, 'Jane' fans know she's been caught up in a love triangle for some time -- between Rafael and Michael -- so getting hitched to Raf is certain to delight ... and disappoint.

Then again, they could have been filming a dream sequence or some other curveball could come into play.

All we know is what we see in the photos.