Wedding crashers are often a couple's worst nightmare. But when the crasher is a giant sea turtle, the bride and groom might let it slide.

Redditor In3 posted the following picture Sunday after tying the knot in St. Croix, where a very unexpected wedding guest showed up.

But this wasn't just any old sea turtle. As many of the commenters pointed out, it's a leatherback -- the largest living breed of turtles on earth. The wedding guests witnessed a very cool moment: the laying of its eggs.

As Redditor In3 explained, "It came ashore, circled around digging a hole, laid its eggs on the beach, covered them back up, and rolled back out into the ocean."

Now that's how you make an entrance.