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Cassie Randolph never starred on "The Bachelorette" ... and, now she never will -- because she and her man Brighton Reinhardt just tied the knot!

The season 23 winner of "The Bachelor" and her better half flew down to Costa Rica to say "I do" ... and, they looked head over heels before they made it official. Backgrid

CR kept it classic in a timeless white dress with a veil streaking down her long blonde locks ... while BR looked stylish in an all-black suit -- a white rose sticking out of his jacket pocket.

The two laughed together, kissed ... and, genuinely looked like they were in the midst of the happiest day of their lives as they walked up to the altar to say their vows. Play video content

Cassie's sister, actress Michelle Randolph ,

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